1) Feels clunky, like UT/Q4
2) The powerups messed everything up, no more exciting overtimes
3) Weapon models look like spaceships
4) Everything that made OSP/CPMA great isn't there (no forcemodels, no enemycolors, no brightskins, no complex weapon configurations, no hud modifications
5) Sounds are awkward and uninspired
6) Timers on items nailed the coffin

I could go on.

Btw, I have not even played the game, im just doing a prediction.