I don't think they're overpowered right now - if anything, they're weak now.

Considering the fact that there's a major shortage of Shinobi after the war, virtually all of them are out doing missions to keep face

and also they sent a bunch of gennin with a rookie chuunin leader to get back an extremely valuable leaf member that is part of an extinct clan simply because they didn't have anyone stronger to go instead.

That says weak to me, not overpowered.