And in just those two words is the reason why I'll never watch Gurren Lagann (or anything by GAINAX). FLCL was great, wonderfully surreal with characters to match. But continuing to make more series with the same character design style was where GAINAX failed - and continue to do so. The characters are as ugly as those in (Set FAIL For) One Piece. At the other extreme, Code Geass. Sunrise hiring CLAMP to do the chara designs was a masterstroke on their part; it certainly helped to make the series a phenomenon in Japan.
The moral of this story is: hire Keiji Gotoh to do your character designs, GAINAX (and better writers too). Then maybe your creations won't FAIL.
Have them redone by Keiji Gotoh (preferably with all-female characters), then get back to me.