izigame.me

I do think the DLC is quite good. It's more Lies of P, so if you like the base game, I think there's a good chance you will like the DLC.
I was taking my time, doing every side story I could, trying to find secrets... and it took me 7 hours. That was first-trying every boss though, and only dying very rarely in levels. If you die a lot, it could take you longer, but if you speed through it, I'm guessing you could finish the main story in under 5 hours.
Is that worth half the price of the base game? If we're comparing value, then definitely not. If we're comparing this to DLC in other games, Shadow of the Erdtree is more expensive, but has way more content. Code Vein's season pass is a little cheaper, but has way less content. Personally, I was fine with this, but the price is fairly steep. If I hadn't enjoyed the DLC as much as I did, I definitely would've felt scammed content-wise.
Speaking of content, there are several new (and fantastic) bosses, several new (and fantastic) weapons, several new (and fantastic) characters, some cool new legions arms, and a bunch of levels to explore.
The DLC's quality is a bit higher than the base game in my opinion, but it shares the same issues (also the same strengths). Don't expect any major improvements, but do expect the same great storytelling. I was worried a "prequel" would be pretty boring, but it wasn't boring at all. You go back in time and can affect certain things in the present (nothing major though). It was really interesting.
There are things I think they could've done better though. I had controller issues every time I launched the game, and it was pretty annoying getting my controller to work. There aren't nearly enough upgrade materials, and I couldn't really use a few of the new weapons because of this. I personally had a perfect save to start the DLC, but I understand that it could be pretty annoying having to progress through the base game again if you went on to NG+ or lost your save.
One criticism I'm seeing is that the DLC is too difficult... but that's the one thing they did address. They added two easier difficulty options. If you're tired of getting 1-2 shot, just swallow your pride and turn down the difficulty. If you're the "git gud" type, then you do you, but don't leave a negative review because you think it's too hard. Maybe the balance is bad, but again, there's a solution. I thought the balance was atrocious in Shadow of the Erdtree, and the solution there was to run around collecting Scadutree fragments for an hour. Here, you just need to change a setting in the menu, which you can do at any time.
So... in conclusion, ignoring the price, this DLC is fantastic. If you look at the price, then it's a more tentative recommend from me.