Unreal II was a massive let down. The trailers sold it as a gorgeous (which it was, I suppose....) FPS blaster but it was slow as hell. More in line with Halo but with less originality.
Quake 4 gameplay IS intense! What level of difficulty are you playing it on? Cos on the hardest setting it's a damn intense shooter, with very twitchy battles at close quarters and some awesome long range firefights too! Not to mention the darkness being used (never overly) for great effect.
The movement let the Multiplayer down - they should have replicated as best they could the perfect Quake III movement, but I guess the engine differences were not up to it, and they wanted to add something 'new' (crouch jumps were never gonna work though, really!).
I'm surprised you didn't like RTCW. Again you're supposed to play it on hard settings, and the game WILL be hard with the enemy AI hitting you because back then, well, games were hard. None of todays immortality bullshit. U needed to conserve that energy and travel back to find the health kits you had left behind. The difficulty is what makes a game interesting and challenging. Rather than just an 8 hour sit through.
I5-2500K @ 4.0Ghz + R9 290 + 8GB DDR3 1333 :: I3-540 @ 4.2 GHZ + 6870 4GB DDR3 2000 :: E6300 @ 2.7 GHZ + 1950XTX 2GB DDR2 800 :: A64 3700 + 1950PRO AGP 2GB DDR400 :: K63+ @ 550MHZ + V2 SLI 256 PC133:: P200 + MYSTIQUE / 3Dfx 128 PC66