Most overrated hentai character...

Was never really a fan of loli, so characters like Louise(ZnT), Shana(SnS), etc.

Only exception would be Taiga.

I came to this thread to be utterly confused and expected learn more about hentai characters but alas, it is actually discussion about normal anime characters featured in hentai. I am disappoint.

Naruto characters, mainly Tsunade. Of the hentai I've seen of her, the art quality is very low but somehow people still read it. I guess if you had nothing to read then sure, I guess that's fine. Whatever gets your head shaved.

Black Rock Shooter and the other girls with her.

The K-ON girls. There not sexy, just retarded.

Just remembered, I wanna add Code Geass' C.C.

Kallen, yes, C.C, nope.

I can't really think of any other, than the already mentioned here, but I do think Tifa is a bit too overrated...

I think the oly retarded one is Yui, damn I hate that girl!

Pax

I think it's Tifa.