Even though I can't claim that I've watched many Mechas, I'm a big fan of Mecha genre because of my love for sci-fi and robots. Knowing the fact that most of the Mechas having trouble with their scripts, I try to choose ones that have something to tell (e.g Code Geass, Neon Genesis Evangelion etc), not the ones just showing big robots with great action. The first season was great, actually, I hoped it'd be something like Code Geass, which is one of my favorite Anime. But then, came the disappointment. The start of the second season wasn't bad but as the Anime got closer to its finale, things really got out of hand. It had the material enough for at least 30-40 episodes but instead, it ended in a really unsatisfying way. But I still think it was worth watching despite all the flaws, and I have to say that the music (especially the first season ending song "aLIEz") was pretty good.