I find driving in Halo to be a bit floaty - especially the buggy. The reactions for UT vehicles are bit more crisp and immediate, IMO.
Agreed--except for the Raptor. I love that thing, but its movement is too gradual. Frankly, for the difficulty it has in aiming at and damaging targets (those laser balls are weak...), the thing should at least be more responsive, especially when turning.
On a side note, does anyone know of a command to display an in-game frame rate? This is driving me nuts.