I'd agree with you on the Ostrich, a very tasty meat indeed, like a very good cut of beef - I've only had it as a steak though, I presume the burgers are pretty damn good though.
Crocodile isn't worth the bother IMO, it's just expensive pork.
They do but you can't eat it as a burger, you have to dismantle it because it's all height - tasty height but far too big to chomp on. We went out last year and I told a couple of the chaps in the office to try them, I think one of them is still trying to finish it
I had a slug & lettuce one a week or so ago and they seem to have gone back to the better burgers again so I guess a few people must have complained or I just had a bad one. 8oz is generally enough for most normal humans once you combine the fries, salad and a side order of their wasabi tempura veg.