As a Japanese speaker, I find it hard to not notice how well-written the dialogs in Gurren-Lagann are compared the medium in animation. For a small comparison, everyone talks like they're in some kind of modern Kabuki-Shakespeare. Kamina is almost singing, his speeches rhyme and have symmetrical meter.
I mean, watch the conversation between Lord Genome and Anti-Spiral in episode 26, and listen to Kamina's speech to Simon. The switch between questions ending in -ka and vowels ending with -a making it sound so goddamn perfect and natural, but it's hard as hell to talk like that normally.
Compared to not only other SR shows but the medium itself, it's an amazing accomplishment.