After the first few chapters I wondered how it could become good with such a crazy setup (mainly with the fetishes) but it actually had decent character development for many characters, often with the help of the male lead.
You have to accept some things like they are without thinking about them, though, no real life logics apply to many things that happen here, so no point bothering.
The art was very average, nothing outstanding, nothing terribly bad.
The comedy went way beyond the usual pantyflash nosebleeds, falling into boobs and other stuff you'd expect with those tags, in fact, there wasn't that much ecchi at all, at least compared to similar mangas.
All-in-all, I found the comedy to be quite good, not quite on the level of GTO crazyness, but well above genre-contestants.
The characters were very likeable, that is, if you like (or at least, can stand) tsundere characters, of which there are 2, one is the main heroine and the other also frequently appears. I'd definately recommend you to keep away from this if you don't like tsunderes, especially the lead female is a hardcore tsundere.
The ending:
As the ending, I consider anything in the last 2 volumes, that is to say chapter 100-119.
I found it to be a good ending, definately better than most mangas, some gripes about it, though.
Starting from chapter 100 the storys of the supporting characters were VERY nicely wrapped up (with the help of the main lead, tightening their relationships), many tearjerker moments, be strong! ;)
The ending chapters are only about wrapping up the relationship between the male lead and the female lead, some comments:
Good stuff: His final confession was one of the best I've ever seen in manga, heads up for that!
Bad stuff: Bringing the ex-bf back again was bad.
After those very good chapters in the last 2 volumes I was expecting an EPIC final chapter, but just the last chapter alone (remember I consider the last 20 to be "the ending") was MEH.
Why the hell did he have to bring back a whole harem of parts, that completely ruined all the buildup towards the last chapter, well at least everybody's happy in the end, including the female lead (can't remember her name no matter how hard I try, despite reading this in only 2 sessions)