I enjoyed it, thought it might be too slow for some people. It's a slice of life type anime about a guy scared of going out and dealing with people and this girl trying to help him.
Some of my favorites would have to be: School Rumble(extremely funny show), Welcome to the NHK(hard to describe lol), Bakemongatari(lots of scarcastic humor), When They Cry(gory and mysterious), and Girls und Panzer(girls and tanks, what more could you want?).
I can't understand why he would start shooting children, even if he hated society or whatever reason, the children never hurt anyone. Personally I don't agree with banning guns, if we do, the only people who will have guns will be the criminals.