I never understood why "fan service" is a bad thing. Everything has "fan service" because you want to please the fans:
Westerns have shootouts. Western fans like shootouts.
Detective stories have mysteries in them. Detective fans like mysteries.
"Fan Service" is just a derogatory term for a "trope" (which in itself is becoming a dirty word in this era of deconstruction we're stuck in.)
tl;dr: nothing wrong with fan service everything has it.