Fanservice.... sounds really good to me at a glance.
But I'm not huge into anime, so the mention of hentai had me look up what fanservice in anime typically entails-- which is that borderline hentai, sexually overcharged kind of stuff that, fair enough, I'm sure there's a huge demographic of anime fans that love that shit.
I'm not big into erotic cartoons, though, lol. Fanservice in an anime for me, would be to give me incredibly long, intricate arcs and... well.... a touch of fantasy.
It may be mainstream anime, I don't know or really care.... but the kinds of anime I'd be into would resemble One Piece, Dragonball Z, Yu Yu Hakusho, Bleach, and mayyyyyyybe, just MAYBE Fairy Tale (I still haven't gotten through that one but I tend to have enjoyed what I've seen thus far.)
I like getting caught up in hundreds upon hundreds of episodes full of good storylines and plenty of superhuman-kind of action.
I tried getting into stuff like Katekyo Hitman Reborn! but..... it just didn't hold my interest after a couple dozen episodes.
I don't mind love interests and a little bit of romance, I guess, but those are two things I really don't watch anime for. If I want to see something like that I'd probably go with a live-action movie or television.