Wow, I just downloaded the UT2004 demo to see if my old (extra) PC would play Thief: Deadly Shadows since that game uses the Unreal 2 engine (which UT2004 is based), and I just pwnd everybody... it was awesome (I won every match I played, even my first.. with full rooms). And this game is quite fun if you like crazy deathmatch type gameplay.
My old PC=: P4 3.06 HT, 512 MB X1550 PCI card, 1.25 GB ram, Windows XP.
And the game runs incredibly smooth/fast on my 1080p monitor. (shrug)
A big wtf.
I guess these older online games had to be designed to run at low spec due to the bandwidth back then.
I just played again and it was the same people playing in the quick actions room (and I pwnd them even worse this time).
So.. I might be playing some not really gaming people stuck with this game because of bandwidth and PC specs (and game price).