All below here is about the "'faithful' to Quake: yes or no?" from me.
soldier: Uhm... Y M C A! Looks gay. Even Monkeyrat's
http://members.optushome.com.au/~plaguespak/screenshots/player.jpg looks better (his weapon models are great even not 'faithful'.)...
fish: The first one looks ok. But that is maybe the most easy model.
shambler: Looks way too skinny and not evil enough. The head looks bad and I agree with than about the claws.
shalrath: Way too insectoid. And the legs bend(?) into the wrong direction! Also it lost all his female looks, the face, the arms...
fiend: pretty good, but I don't like the huge horns and the "face".
hellknight: Did anyone say Diablo? Looks absolutely too "good".
ogre: Totally wrong. He is too tall and not fat enough.
dog: Looks like a real rottweiler = good :)
enforcer: wtf?
wizard: A weird mix of human face and elements from 'the' Alien. Not too bad, but not faithful at all in my opinion. The original wizard has some "bird-like" appereance in it's face (I can't explain that really good... Maybe you know what I mean.)
tarbaby: So who but silicone on his joystick?
The animations just look awful.