My three teenagers all liked it. Nice effects, typical teenage storyline. Personally, I'm disappointed with Chris Columbus. Too many times the dialog was absurdly simple-minded--along the lines of a Scooby-Doo cartoon. Often, the characters' reactions were mind-boggling. You're told that you're a demi-god and it never occurs to you to ASK who your father is? You're just going to follow along until you pick up a trident, and figure it out for yourself? I've been to worse kids' movies, so I don't mean to be too critical. I was just hoping for more.
This version was better than the first only in that it has a better script, a better cast, better acting, and better directing than the first one. It's to be expected that the CGI would be better, but it was surprising how much better the entire production was. I'd heard stories about how the movie studios had hurt the production of some of the Marvel movies in the past, but wasn't sure how credible these were. If Incredible Hulk and Iron Man are any indication, Marvel's self-produced movies are going to be ones I enjoy the most.