Maybe 'despise' is being a little harsh, but I try and play the game and I can't help but feel that Epic ruined UT with this game. I'm just not a fan of the new levels, the graphics, the weapon tweaks, and as you say the vehicles went way downhill.
Also part of the problem, and this could well be my fault and not the game, but I kicked serious *** in UT99 and 2K4. I simply blow in UT3 though, I feel like something is wrong with my mouse when I play it.
I think that was my logic, lol but haven't tried the game in months now. This is what I remember not liking way back then