Personally, I cant stand it.
Most fanservice is awkward, annoying, and takes away the little respect I might've developed for a character.
Take Gurren Lagaan for example: the lead female Yoko, was MADE for fanservice. Supposedly, she's this super-tough sniper, fighting giant robots in a bloody war zone, while wearing a fking bikini - for the ENTIRE show. Like, seriously? If you are putting in fanservice for a series, atleast TRY to make the character believable ffs.
I dont see how people can say FS makes anime more 'real' or 'human', cause there's no fking way you're squeezing a random girl's tits and getting away with it.
I guess the ONLY reason fanservice exists is for pervs to jerk off to teenage cartoon characters. Its awkward, and I stand by that. It wont prevent me from watching anime, but I really really wish FS wasnt there at all.
The producers can perv with hentai all they want, but anime would be better off without it.