Oh and people must remember that however good BJJ is in cage/MMA fights, in real life its just not practical to start grappling someone on the road/pavement (especially if he has friends who kick your spine while you're busy grappling).
Hmm I've watched lots of JuJitsu training sessions and after most of the techniques both attacker and defender end up on the ground.
Anything can be useful if you know how to use it well, and instinctively. Thats the key word, 'instinct'.
That is why I never want to marry an American.