Hellboy 2 takes the main characters from the original and moves the story along a good deal further, explaining a bit more of Hellboy's past and pointing in the direction of his future, but at it's heart it's just a love story. Sure, it's hidden in a spectacular fantasy action film, but it's just a simple 'boy meets girl, boy and girl get together, boy and girl figure out how to live with each other' tale.
Ron Perlman and Selma Blair are excellent actors who you don't see a great deal of. They have genuine chemistry on screen, and there's one scene in particular where Hellboy and Abe get drunk that had me laughing like mad.
Being a Del Toro movie, the special effects and CGI is spectacular, and the creatures featured in the movie are way better than anything normally seen these days from Hollywood. He even manages to squeeze in a token 'environmental monster' without it feeling too forced.
I think a third and final installment is most definitely in order and would round the series off nicely, preferably with the same cast and crew.
I look forward to seeing his version of The Hobbit.
8/10 - Even The Demon enjoyed it.