I don't know about anyone else, but I found Isuzu to be really annoying. I could barely stand her. If not for that scene in the beginning (which I am now deeply looking forward to), I would be tempted to avoid this series for her. She's completely obnoxious and really clingy.

A lot of the other classmates were too, but thankfully Kushinada put all of them in their place.

Peach Pit is another problem. They can be very hit or miss. I liked their designs for Rozen Maiden and DearS, but Zombie Loan and Shugo Chara throw me off. Here, Hiroshi's design is very ambiguous in terms of gender. While watching the OP, I was convinced he was actually a she. The uniform design only makes this problem worse. Rather than a regular shirt or something like a gakuran, his shirt looks like a sailor uniform. When you can't see the pants, he completely looks like a girl. Being voiced by a female seiyuu isn't helping his case much either.

Those two gripes aside, the series was interesting, and probably worth following, though quite frankly I hope it mostly consists of Kushinada killing over everyone that gets clingy and close to Hiroshi.