Agreed, i'ts probably the hardest tank to take out in game for some reason. Which when you consider its basicaly a T34 but without all the armour is damn annoying.
By the way, does anybody know where the ammo store is on it in game? Does it even have critical locations? I've yet to see one blow catastrophically.
Incidentely I believe the BT-7 in it's earliest form was actually able to run without its tracks, directly on it's road wheels. In this form it was much faster on roads, but in order to fight the tracks were always fitted. This may be why it's sometimes listed as having a faster speed than it appears to in game??