I know many people are trashing this film, and I admit it's not the greatest, but it is definitely better than it's predecessor. I actually consider this film to be an unoffical sequel to the 80's "Clash".
Now again, don't let me get anyone thinking this movie is going to blow you out of the water, but just contrasting it with the first film: In the first, Perseus was a whiny little baby, didn't want to be a hero, complaining the whole time, atleast here he's just like "OK, I'm a demi-god, let's do this thing". I thought Cronos was really cool, fans of "Age of Mythology" should like him, Rosamund Pike certainly wasn't hard on the eyes and she fits the Greek beauty perfectly.
All in all, this was a fun film and huge improvement over the last one, I know it didn't do well in the theatre, but I think if you liked the 80's film this is a pretty cool modern continuation, and atleast in the this film they gave a respectful nod to Bubo instead of insulting that much beloved character as they did before.