I'm actually quite happy with that last book, I definitely enjoyed it better than I did the first one. The "love triangle" was solved quite well, and the action scenes made for a good change of pace. 
 An enjoyable trilogy, not the best YA books ever but still nice if you like that type of literature. And there's a few good ideas behind them as well, though it would have been nicer if they had been more fleshed out.