The second half of this show is extremely janky.
Okay, I'm not really the best person to go to when Mech is involved, but Gurren Lagann is just great.
It looks relatively simple at first, a typical anime about overcoming the odds set in front of you, but then you take a second look and start think it in a completely different way. Can't give too much away, but by watching it again I've realized how amazing it is. At times the show actually seems to give a little nod Gainax's mecha past, and using such things to it's advantage. Gurren Lagann is often called the Anti-Eva but it's not, really. The way I look at it, the two are best watched together in order to truly appreciate them both for what they are.
Just my opinion, though.