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As of episode 4:

Humor: While keeping with the tried and true anti-sexual straight man + wacky pervy girl 4-koma high school formula, Aho Girl keeps the gags fresh enough to keep you entertained, but may feel a bit cringy for some due to the occasional immature jokes. It's one of those anime that you will have a hard time defending (as I have here), but if you're like me you'll still keep on looking forward to the next episode's release. 

Characters: The cast is likeable enough and unique enough to keep you engaged, but so far they are pretty flat. Don't expect a deep character-driven story out of this one.  

Honestly though, i think if you watch to about 4:18 in the first episode you'll know whether you'll like it or not. (or watch till 5:30 to meet the best character Yoehiko's mom - "chirda")