izigame.me

Summary: An excellent single-player experience. Enjoyable combat + unusually well polished and problem-free. Don't get the DLCs, though.
If the combat style is your thing, you'll find lots of fun here. The combat is fluid, delightfully responsive, and can be approached in multiple ways. The three methods of fighting - straight melee, stealth, and ranged - each come with abilities that are fun to unlock, fun to use, have satisfying effects, and can be switched between as the situation demands.
Suppose you're facing a tower with an archer on top and two more Orcs below. The ranged ability Shadow Strike teleports you to a target on top of the tower; after dealing with him, you draw your dagger and stealth-leap down at another target below the tower. The remaining Orc you Drain (replenishing elf-shot that used for the Shadow strike), then finish him with your sword. Feels great.
The rune system for weapon upgrading is just well enough developed to meaningfully affect combat, while being simple enough not to become a pain in the foot.
Essentially no aggravation or quality of life problems, either. Surprising, for a relatively modern game that was also released on consoles. The only issues I had were in the menus, specifically the appendices: Q and E flip through pages a lot slower than mouseclicking, for some reason, plus it's easy to scroll past a new entry without realising it's a new entry. But that's nothing related to gameplay, and therefore not that important.
Bugs - I haven't run into any. I wish it were the norm, especially for games long past release date, but instead I feel compelled to mention this as something remarkable. EDIT: okay, I found one. It's possible to end up with extra unspendable skill points somehow.
One minor complaint is that there's no real way to get yourself cornered and overwhelmed by making bad decisions. You can escape any situation just by running forward in basically any direction, and climbing any walls in front of you. As soon as I realized that, the sense of being in enemy territory diminished greatly. You just go around like you own the place. In Mordor.
One might wish for more facets to the game. In the end, Shadow of Mordor is an open world Orc killing simulator. With a story. This isn't much more of a problem than a straight first person shooter just being a shooter. But with only combat going for it, you do get bored faster than with some other single-player games I could name. Not too fast, though - what the game does do, it does well.
The only thing that ticked me off about it was the DLCs are/were confusing. Even now I'm not sure if I have all the DLCs I should have. WTF is a "season pass"? What is this game, an MMO or Diablo clone with "seasons"? Is the pass going to run out when the season ends? Publishers, why can't you just name and do things in a straightforward manner...
Also pity about the shady business practices revealed by TotalBiscuit at the time of release; it was *surprising* to learn about that after playing the game, because any reviewer worth his salt was going to be positive about this game anyway, without such shenanigans.
EDIT: After examining the DLC situation more, I see now there's a reason these DLCs have horrible reviews. They are mostly pointless cash grabs, and misleading, too - some of the individual DLCs are included in others, leading you to possibly paying twice.
Only get the Bright Lord and Lord of the Hunt DLCs, which add new stories. Most everything else is pay-to-win nonsense, you basically pay for runes, breaking loot progression. What's the point of actually using the Nemesis system to hunt for high level runes that restore health, when you can just pay money for a rune that gives you +50 health per stealth kill?