Thirded. We need a "mangled" (semi-functional) status between OK and wrecked. * Taking GVs out can be even less rewarding than taking buffs out due to this. I dont give a wossname about perk points, but I hate the tendency to all-or-nothingness in a lot of cases with GVs.
Esme
* suggestion: like a mangled track one side will only function in first gear and/or reverse. A mangled gun MAY (if you're lucky) still function, but with a reload rate 4 times longer than usual, perhaps. Mangled engine might mean instant KABOOM, or might mean a fire starting that will after a short while mean KABOOM. Hitting a tree (unless at very high speed) should mangle, not kill. Mangled turret jams in one direction.
Oh, and can we have a BT7 light tank for the next GV, please? :-) (eventually I'd like to see 1-3 GVs from various nations, plus some artillery pieces, but little steps, little steps.. :-) )