Lol yes really.. Mei would lose to Raikage by herself high diff so adding Zabuza and Asuma is overkill. He can't blitz Mei without his hand getting boiled, if she can boil her own body like she did against Zetsu. While he is burned he will cut his hand off so he only has one left. While Zabuza sets up Hidden Mist and Mei is still alive (Even Juugo survived 2 attacks of A's), Asuma will use Fire Release: Ash Pile Burning which A probably tanks, but it destroys his other hand at least. Then Mei and Zabuza'd combined Water Release mix with is Lightning Armor and his whole body is electrocuted. So, they win low- mid diff leaning more toward mid diff.