Haven't actually seen the first series yet, and for all I know, I might not like it, but I do know that, if nothing else, the girls are cute. Oh they've gotten plenty of hate in certain circles simply for their character designs. I can't speak for Clannad and Air because I haven't seen them (well, I saw one episode of Air), but in Kanon's case, I think hating the series for being moe is unfair, because Kanon was actually pretty good.