Gurren Lagann is a very enjoyable series.
The characters are very deep and insightful, and you really get addicted to their journey for the heavens.
The story is great, though used. A story bout the underdog rebelling, is always great, and this is very much one of those. But the story gets a bit thin about ep. 14 or so. I got bothered by childish stuff a few times in the series as well.
I would have loved this series, if they would've made the fights a bit different from each other, but they certainly are not. When you see the first few fights, you pretty much got the whole fight and the outcome figured out before the fights even begin. Very sad indeed, but.. I loved the story and the characters.
Mep