I wonder if Strike Witches may count as offensive. I've watched a few episodes of it at a convention yesterday, and it seems like Gonzo (the studio who worked on the series) went nuts when it came to fanservice.
The most obvious thing when it comes to the series is the fact that almost none of the main female cast where no pants whatsoever (of course, given how pants or skirts may result in a "death by cape" moment if the cast wore them when wearing the Striker units, that may be understandable). However, that's just the tip of the iceburg, with the fanservice levels ranging from the "normal" outfit for the school that main character went to while living in Japan (basically a sailor top over a swimsuit with no skirt whatsoever) to a bath house scene where the nipples on most of the girls are clearly visible. To make things crazier, this was being shown during the afternoon hours, with no one being "carded" when it comes to entering the video room. I think I can see the complaints coming right now.
However, the fanservice is possibly one reason why I'm tempted to pick up this series when it comes out next month, since I'm curious to see how much further Gonzo will go when it comes to getting away with certain types of fanservice on a show that aired on Japanese TV.