I have to agree on the atmosphere part, a few of the levels in U2 were able to give that suspension of disbelief and evoke that foreboding feeling that makes you want to stop playing otherwise you'll freak out.
Unfortunately, when taken as a whole it's still pretty stale (And the lack of good gameplay doesn't help.)
I wasn't expecting anything new either (I also believe the innovative argument is flawed). IMO a sequel doesn't have to innovate or break new ground, but it should expand on the successful concepts presented in the first iteration. Unlike many of the great FPSs sequels we've played recently, Unreal 2 doesn't do this and instead tries to cash in on current FPS trends towards linearity.
As for the technical aspects, I hope they do fix that sound problem. On my system it isn't just limited to EAX usage (The "UseEAX" parameter), but 3D Sound in general ("Use3DSound=True/False".) I ended up playing most of the game through headphones since I couldn't use my 4-speaker setup without risking a crash.
"Nothing livens up a robotic hymn of doom more than an amazing pair of jugs." - Brak