Ummm... what?
Did you try driving 2k4's Goliath around? It was like a frigging brick.
Well, isn't that supposed how a, oh, tank, should feel? It's a multi ton monster, not a buggy. UT3s' version reacts way too quickly, especially on the accelerator and brakes (unless real tanks behave the same way but I can hardly imagine that to be honest).