I'll be honest, I never had any real interest in this movie, but on a whim decided to give it a try. I'm a sucker for Greek mythology and thought this movie might be a fun little sleeper hit. Movies based on children's books don't have the best track record, but there's a few gems in the bunch. That being said, I should have trusted my instincts.
The Lightning Thief isn't a terrible movie, in fact, there's some real potential in it, despite being a Harry Potter clone. It's got a likable cast and some real talent, but most of that talent is completely wasted. The script is middling at best; it's never completely cringe-worthy, but it contains all the same sassy and cliched jokes we've come to expect out of movies aimed at a younger set. The story, while familiar, is actually kind of fun. I liked the idea of the demigod offspring of Greek gods coping in the modern world, but unfortunately we never really get to explore that aspect. In fact, for being set in a modern world, the movie never really juxtaposes the old world with the new. Percy is given a "magic" pen that turns into a sword at the click of a button. That makes for a nice toy, but I can go to a local Wal-mart and buy a rifle that will do more damage. Percy can control water as if it's an extension of his body, but he spends the entirety of the movie fighting as if he were in a sword and sandals movie. Short swords and bronze shields are the go-to weapons, despite these kids being the by-product of gods and having comparable powers; they're forced to fight as if they're living in the Bronze Age. When I saw a group of youngsters at an archery range (preparing to battle hordes of magical beasts) my first thought was, "Why don't they just get some guns?" I understand that such things don't exist in Greek mythology, but this movie is set in the 21st century. And that is where the movie mostly fails for me; I felt like it just forced me to make too many leaps of logic. I can handle the fact that minotaurs are real, I can deal with a jive-talking satyr, but I can't understand why the entrance to Olympus is in New York City (among many, many other logical inconsistencies, though I can't divulge them without spoiling the movie).
In the end, the movie is just another bland effort at getting a franchise off the ground. It's certainly not the worst of the lot, but it's completely unremarkable in every way. Not recommended.
I should note, however, that I did enjoy the Las Vegas sequence.