Yes, the fact that it was mostly solid on the ground was good, you could flip it over, but it would mean match done, which is fine, you couldn't flip it over where it would stay alive after doing so anyway, unless some lag happened and you were a zombie at that point...
Technically, I think you could drift on 3 small wheels lol.
There was one occasion when I didn't fall off the rooftop, for some time anyway, when I was outside the arena during a game, was thrown there by a rolling pin, strangely enough the dude followed me after that driving through a wall, I still get nightmares about it from time to time. But yeah, some indication could have been useful, but it was pretty fine as it was.
About weapons, they indeed didn't deform the chassi, but as far as ruining a paintjob they did the job, so I guess it was just harder to implement real physical looking damage.