Hellboy was a very good movie. I enjoyed how the villian wasn't a bad guy just to be bad, he had a belief and something he followed. Luke Goss was excellent as the Prince.
You may remeber his from Blade 2 he played Nomack, which was directed by Guillermo del Toro as well.
The action was excellent, the love story could have been developed morwe but it was still good. Some of it was obvious (no spoilers) when and how certain things were going to happen.
This was a good, I won't give you any spoilers, but you need to see this on the big screen. The movie was casted very well. The plot for this was good even with mythological tones.
At this moment I don't have a favorite scene, but for any comic book movie lover or if you like movies where the hero finds his calling. This is for you!