Thread:Deathstalker666/@comment-24111404-20140722230731/@comment-3547390-20140723211501

Well, you can check out all the level pages and videos if you want a really detailed answer with risk of spoilers...

But the short answer is, it is terrible in comparison to everything else. There isn't much added to the game besides new textures. The rooms are all rather basic, there are no differences to difficulty or music, and there are no exits in the singleplayer levels. The good news is that there are very few that make it impossible to kill all enemies. There is also a few duplicate levels that have the same geometry but some small changes. So, yeah, not exactly the best thing. I wouldn't recommend it.

Personally, I could care less if a level is terrible anymore. It interests me just to see a new level and log it down in the Wikia. I probably wouldn't have lasted long in Q2 if it didn't.