izigame.me

Foxhole is truly a gem of a game, albeit for the right player. Take everything below with a grain of salt, and consider this is all told from the perspective of a Medic main.
Pros / What I like
What I love about it the most is that you are a very small cog in a large machine, and you'd better get used to the thought when playing! No one player can have an astronomical impact on the front as far as gameplay goes. No one player is going to kill you and all the other friends around you, blow up a tank, and then run laughing back to their lines. Yes, you might get outskilled on occasion, and feel frustrated, but in the long run it is hardly influential to the outcome of the war or even the stretch of front you're playing on. This aspect, apart from allowing even a complete newbie to have fun, encourages cooperation among players (you won't see any squad of 4 people hopelessly destroying your team like you see in Battlefield). Everything turns out better when you work together with your fellow soldiers!
Another thing I enjoy about the game is that it has one of the best blends of realism and goofiness. It is realistic where it should be, as a wanna-be milsim game, and goofy where it would be too annoying to be realistic. The mechanics are generally fun, the art is lovely, the gameplay simple to grasp. The map is nicely constructed to allow strategical positioning and building, while retaining a cozy feeling whenever you drive around the many different and unique places. Not to mention there's also a little bit of a backstory to it and easter eggs scattered around for players to find.
Continuing the list of aspects I like, I have to mention the fact that winning doesn't matter in this game. Yes, the plot consists of an all out war between Colonials and Wardens. It is a nice morale boost and source of pride for a faction to win a war, maintain a long winstreak, or win significant wars when the playerbase soars and tactics and determination of both factions are put to the test. But does winning matter down to the individual soldier? You can still have fun regardless. You can still crack jokes with your friend while under artillery barrage. You can still catch an enemy tank offguard and destroy it. You can still conduct an operation with your clanmates and push the enemy back. Rude as it sounds as a premise for a game, most of the *fun* in foxhole is derived from the amount of misery you can provoke to the enemy. The more painful you make it for them to take territory, consolidate already occupied one, bring resources and even walk to the front *cough cough artillery barrage cough*, the more fun it is for you. That is, until you're at the receiving end of the same treatment :D

To summarize, why is Foxhole fun? It's a persistent all out war in which cooperation rather than individual skill is the key to victory - which I believe should be the goal of every multiplayer game that pitches one team against another, but none that I played have managed to do so in such an organic way. Not to mention the fun community, the jokes, the roleplay, and the dude blasting Fortunate Son in local voice chat.

What you might not like
Now, let's see what aspects might not appeal to people.
For starters, while I said the mechanics are pretty simple, it will take you a while to get your head around them. The game has a tutorial area in the home region - it's okay for a new player I guess, but somewhat inconvenient since you need to read signs and what not. It's much to learn, but I have always found veteran players willing to teach me in a very friendly manner, and it's way more engaging. I still haven't learned how to build bunkers efficiently after 2k hours, but I know many people who do and whom I could ask for help when needed.
Another fundamental yet debated topic is Logistics - basically, everything that goes on so that rifles, ammo, vehicles and everything else gets to the front to be used. It's a time consuming process, involving quite a few hours of work depending on what you want to build and ship to the front. Harvesting resources, refining them, turning them into gear and transporting are all simple mechanics, but you need to do them over and over again if you want a healthy stock of supplies to support a front with.
We should also talk about facilities. They are relatively new to the game and are an entire new level of logistics gameplay. In short, they are a pretty long production chain of resources: you build buildings that produce a type of resource using already available materials. Then that resource is used for a new building, producing the next level resource. At the same time, all these resources can be used to upgrade vehicles and make new toys of war. The problem is, it's hard, if not impossible, to do this solo. While regular logistics are ok for a solo player, facilities are usually maintained by clans, where all members pitch in a little and hence the workload is lessened on everybody. Some people / regiments take to maintaining public facilities which you, as a solo player, can use for upgrades freely / for a resource fee. All in all it's not that bad, but doing a solo facility is like getting a job so, for your own good, please don't.
Some people accuse the community of being toxic - in any community you have some bad apples. What bad apples can you expect in Foxhole? People who think their in-game rank gives them authority. People who try hard and start blaming newbies when things go wrong (i.e. their tank gets destroyed and they blame the nearby privates and corporals for not being able to kill harassing infantry). People who gatekeep new players from organized activities - this happens more rarely but as a new player you might see a big clan (lots of people with the same tag before their name) doing something organized. It looks fun, you wanna help or join in, then they start yelling at you to not do something / not mess with their stuff and all that. Sounds bad, it is to an extent, but most often however, it's just too difficult to integrate a new player into an ongoing operation involving tanks, artillery etc. Too many mechanics to explain on the go, and this equipment is quite expensive. Once you get to know logistics better you'll find out why operation leaders are not too keen on letting new players join in in the middle of an ongoing effort (I have been guilty of this myself a couple times).
Another often toxic interaction is new players building and veteran players telling them to stop doing so. This occasionally devolves into shooting, and yeah, not very fun for a new player. I like to refer to building as a 'delicate art', which myself I don't know how to practice, so building badly can be advantageous for the enemy, and hard for friendly builders to fix after. If caught in such a situation, use the opportunity to ask what you're doing wrong - there has to be an explanation, a reason, preferably a logical one. Try to work out the conflict, instead of escalating.

Many other reviews claim that you need a large group of friends or a regiment in order to have fun. I disagree. I started as a solo medic, had loads of fun at the front on my own / occasionally cooperating with other medics in the same area. I did join a medic regiment and, in time, ended up commanding it, but I integrated so well with the community that I can find another regiment doing an operation at almost any time of day, and they'd be more than glad to have me swing by. You can do the same even by staying solo. Most regiments have auxiliary roles for people who are not members but often play alongside them.

I hope I managed to give you as good of an unbiased opinion on Foxhole. In over 2000 hours I think I can say I've had more than just fun, and I sincerely wish I knew about this game sooner!