You can interrupt any of your regular attacks with a block, it's mostly the special moves that have to finish their animations.
And yeah, the special features have always been great. The Making Ofs have been some of the best in the biz, and it's funny how each game had a new director because the last one would pussy out. I got really excited to see Stig in charge of GoW3 since he was awesome in the GoW2 video lol.
Still, only one unlockable costume? Wat.

