The honest truth is that Gurren Lagann is purely of high entertainment value, but that is about it. Under closer scrutiny the series just plays to our most basic emotions which makes you THINK it is the most amazing anime ever, while in reality it just has lots of fights, lots of heartbreak, and lots of love... three things that humans really just respond well to, and find very entertaning, but this doesn't make it a work of art people...
*spoiler*
I will give Gurren Laggan credit for having a really cool time period jump at the end of the series, which had me going "Whoa, that's a really great move by the director/production team." Oh and Boota was amazing, my personal favorite character...
