Well said. I completely agree. Fan service should be left to series and characters that can handle and support it. It's completely wasted otherwise.
On the opposite side of that, serious and thoughtful storylines should be left to characters and series that can support them. I don't know how many times I've been enjoying a fun, lighthearted show with a lot of fanservice, only to be reminded, "Oh wait? There's actually a
plot going on here?" Stuff like Maburaho, DearS, Yumeria, Magikano, the whole Familiar of Zero franchise, They are My Noble Masters... I didn't invent the "Story detracting from fanservice" tag on AniDB for nothing, after all.