Fanservice when it's warranted is fine. For example, when a girl uses it to make a guy flustered or when it's supposed to create a specific reaction or effect. In Captain Yuri's gif of Hanekawa, it highlights her more sensual nature after the transformation. Anime that revolves around it are fine for what they are and I'm not going to complain about boobs in Queen's Blade.
What I don't like is out of place fanservice or fanservice that makes no sense in the narrative. In the Phantom World anime, it kept showing the cheescake girl stretching out inside the classroom in her gym clothes. It was random and made no sense. It detracted from the show, in my opinion.
So, really, it depends.








