Fun, stupid, well performed, good sfx. Average blockbuster script, that could have been much much worse. Not big, not clever, but fun. See it on the big screen tho, DVD just wouldn't be the same.
Overall: a C+ comic book movie, who's sequel would probably rock a lot more as the first 3/4 of this movie is all introduction to characters.
To compare, Batman Begins would have got an A. Then again, I would have given Hellboy a B+, so draw from that what you will.