Once I got past the fact that there is copious amounts of fanservice, this anime grew on me very quickly.
Sure, there are some plot holes, but the overall story is a good one and develops nicely. The main protagonist's(Ange) character development throughout the series flows nicely and is believable.
After the first episode, I figured this would be just another ecchi anime, but I was thoroughly and enjoyably surprised. I think the artwork and quality are top-notch and the music is wonderful and on-point in emphasizing emotion ion all the important scenes.
The first episode is what I believe turns a lot of people off from giving this anime a fair shake. Watch the first 3 then decide for yourself.