I loved Q1 and custom maps Machinehead (devs behind new Wolfenstein) added to it, but Q2 is fucking boring. Like, really, besides the cool engine, it was just a slow and unimpressive bullshit. Not a Doom 2 level of making a comeback. What I disliked the most, besides irritating enemies, is backtracking to previous maps. It could've been shown as creating a consistent world across maps, but in the end it's just bad design.
I suggest to those reading it to take Q1 instead. Surprisingly, the remastered version runs on Linux without problems. As do many engines created by fans' community. It's just better.