I really enjoyed the movie! It wasn't terribly acted, and I appreciated the abundant use of Greek mythology. It's like learning, only fun. And they were pretty good about sticking to the Greek names, which is always a plus.
I've heard people compare it to Narnia and Harry Potter, but I think it's like Sky High with mythology instead of superpowers.
The other excitement was the refillable popcorn tub. For $6 you get a tub of popcorn (maybe around a size medium?) that you can refill for $3 at any Cinemark or Tinseltown theater. Both nearby dollar theaters and the regular theater right by our house are Cinemarks, and I am a huge lover of movie theater popcorn, so we'll definitely get our money's worth. We haven't seen a lot of movies lately, but it's more fun to see them on the big screen, and we're entering summer blockbuster season. We're already planning on seeing Iron Man 2 in theaters, which is funny because I only saw the first one a few months ago.
Anyway, I definitely felt we got our four dollars worth from the movie last night. I haven't read the book, so I can't speak to any variations from the source, but I thought it stood well on its own. As far as I know they haven't announced any sequels, but I'd be willing to go see them if they do.
So there you have it--good movie, good popcorn, good times had by all.