like many others have said, highschool of the dead would have been the greatest zombie apocalypse anime out there had it not been centered around girls with physics and well, reality defying boobs on everyone but the smallest girl (thank goodness). queens blade is another one which I just stopped after episode 2 (interesting story, practically porn, not my thing). there are a lot of other animes that I would consider good by premise or even in general, but in the end they lack development and resort to all this fan service to compensate (dragon crisis, hagure yuusha no estetica,rosario plus vampire (the manga was better and had a wonderful ending), sumomomo momomo, and many more). it's especially disturbing (not to mention disgusting) when the girls look underaged and they attempt these shots.
on the flip side I think kill la kill is the only anime that actually has a feasible, plausible, and workable reason for it's fan service (in other words it's not stupid shit thats completly out there created with the exclusive purpose of justifying said fanservice like that one show with the grim reaper that saps the ero power out of that one guy for energy. it's really an excuse for tit shots, groping and other things. I also stopped after the 2nd episode). for those of you that have seen it already you know what life fibers are and the truth behind synchronize and override. all of it makes sense, and can even be related to other works of sci fi and comics in terms of concepts.