 If you liked
Tengen Toppa Gurren Lagann
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 ...then you might like
Toriko
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While Toriko isn't exactly a mecha, it shares the concept of something being so bad it's awesome. Both are very testosterone fueled anime, but both also share tremendously bad writing. Luckily, there are moments in both that you can't help but smile at so the awesome overshadows the bad.