I really like ヘタリア but from just recently, a lot of people have been saying that ヘタリア was the worst アニメ created. I'm sorry but I stand my ground and I 愛 it :)
Zero no Tsukaima. I don't know anyone on ファンポップ who hates it, but almost every review on MyAnimelist about this アニメ was negative, so I guess many people don't like it.