I'm annoyed that I paid $29.99 for this at K-mart at launch and still haven't finished it. At $9.99, I'd say it's worth it if you're of the opinion that price should be factored into your enjoyment of a product.
More than anything, even the whiny characters and silly storyline, the worst part of the game for me is that the battle system is really fun to play since you have to react quickly, but actually getting into combat is a pain in the ass because it's almost always impossible to avoid enemy encounters while you're exploring around: there's always a ton of enemies, many of them outrun you, and most of the corridors are narrow.
If you don't mind spending more for a better game, get Resonance of Fate. If you have a PS3, get Valkyria Chronicles.