As a rule, fanservice (as opposed to sexuality) annoys me. If I wanted to watch softcore porn, I have essentially limitless options, so as draws go, it's not a very strong one.

If a fanservice-laden show is good without the fanservice, it detracts from it and makes me reluctant to tell my friends (especially female friends) to watch the show. If it is bad without the fanservice, I don't want to watch it anyway. So it's generally a lose-lose.