It's very cheap 3D - they converted it in a few weeks of post-production after Avatar did so well. The important actors in each shot are popped into a plane of their own, like some sort of moving Guess Who game.
I found the film to be moderately entertaining. A more classically educated friend hated it for its liberties with Greek mythology.
This article is by someone who's seen the original script. The changes mostly sound like they dumbed things down, trading a lot of plot coherence and character development for small gains in pacing. Hard to tell, but it sounds like the better movie didn't get made.
http://chud.com/articles/articles/2...ASH-OF-THE-TITANS-YOU-DIDN039T-SEE/Page1.html