Gurren Lagann is supposed to be the starship troopers of mecha anime. It takes the whole "bigger robot" thing to the only logical conclusion as a way of lampooning the genre, but in doing it so perfectly, it became the very thing it was trying to make fun of.

In short, it's perfect, and how very dare you.

(I liked Alnoha Zero)

Loved the show. Pity they never made a second season, but on reflecting, it didn't need one.