Predictably enough, it depends on the context.
A lot of the gratuitously fanservicey games are at least poking fun of themselves while doing so, and I went through a point about six months ago of worshipping those games. Final Fantasy X-2 is wall-to-wall, but it is completely aware of that fact and has a laugh with it. Sure, that doesn't alter the fact that the fanservice is very blatant, but it does provide it with a context other than just "TITTIES!".
Bayonetta is similar. Completely aware of the character's sexual presence, but having so much fun with the idea that the game itself is enjoyable enough.
I'm led to believe that the same can be said for DOA:XBV, and I did attempt to purchase that recently (CeX couldn't find the disc). Not gonna lie though, its reputation does mean I did almost feel like I was going to have to say "I'm only buying it for the articles" or trying to find another game I sort-of-wanted-but-didn't-really to hide it behind.
Plus, let's be honest here - I'm a dude who likes women. If I'm going to spend an entire 40+ hour game staring at a pixellated arse, it might as well be a nice arse.
So yeah. Games that are fanservicey but aware of it and having fun with the idea? I can get in on the gag. Gratuitous fan service for the sake of fan service? If there's a good enough game to back it up, sure. Otherwise, I'm not going to buy a game on the strength of fanservice alone.