Yeah I saw that footage of an M1A1/2 knocked out by the Iraqis. It was far from destroyed. It was merely burning a little down in the low chassis and had no smoke billowing from it.
It had been knocked out obviously, but I think it wouldn't take long before it was operational again.

To truly kill a modern MBT with an outdated RPG seems to be near impossible, or depend a whole lot on luck. Right now I think one would haev to settle on 'just' knocking it out.

I just find it interesting that since the insurgetns seems to have lots of RPGs that we don't hear of "American tank knocked out" in the media, since a general jounalist or corrospondent knows no difference between an MBT or IFV.
I know the Bradley is rather thinly skinned, so obviously it must have effective support elements (reactive armour).