At first I really didn't like this anime.
The plot seemed absolutely stupid. Sub-Harry Potter stuff. It was just all...ugh. Crappy.
But. I stook at it...And you know. It grew on me.
Sure, its formulaic, sure its got the typical cliche of a bunch of girls being mad about a lame guy. But...you don't always want War and Peace. Sometimes you just want a little generic bit of shallow entertainment.
The big complaint I have against this anime I must say is one which it seems to think is its main selling point- it increased it for the second series. The fan service. Its just...awful. All the constant underwear shots and that effing girl with the lollypop. Its just not sexy! The opening credits for the second series take this to stupid extremes (albeit with a super irrelevant theme song which grew on me).
If you can find somewhere private to watch it though where you won't be judged then its a nice way to giggle away 20 or so minutes. Once you get over the initial reaction of hating it of course.