I just saw the movie and I enjoyed it. It is very much like the 1st one, only funnier.
The movie has great acting, humor, action. The plot itself is a little blah and I won't spoil it for you, but there is a really easy way they could have defeated the bad guy. I was waiting for Klauss or the Abe to say it, but it never came.
This isn't a deep movie or anything. Yet, it is darn good at doing what it is. It's a summer action flick and Hellboy makes fora great character. Here's hoping they don't ruin the 3rd one like they did spiderman3.