Boi, the tits are massive... that's kinda a turn off. I mean, really massive... H U G E.
I'm not annoyed by the fanservice tho, it's well done and it's not just a bunch of accidents that make no sense, it actually have a purpose. The down side is that you must like it, you can't avoid it.
The characters and story is pretty good, so I think that it really worth to check it out if you don't mind what I mentioned before.
Also, an advice, never take the ratings seriously when they have a lot of 1's. Generally they have certain aspect that triggers a part of the community so they just bash it.