Just how destructible is Battlefield: Bad Company?

The blurb says "90% destructible", but what does the Beta tell us?

DICE reckon that "90%" of the game's environment is destructible. So it was only fair that we set about lobbing around explosives like maniacs and put Bad Company's USP through a rigorous stress test. The results are... interesting.

Lots of stuff explodes, yes. Brilliant. But, then, lots of stuff doesn't. Or it does, but it shouldn't- should a chair explode like a grenade stuffed with splinters when you shoot at it with a rifle? Well. It isonly a Beta, after all...