To be fair, water isn't as bad as you make it out to be. I agree that Wind probably needs a buff though.

Water can have pretty massive ninjutsu which is great overall. Using a poison tais team, the higher the nin stat, the higher the poison damage stack. Get the right combo and you can outsustain plenty of other nins, and get through the pesky Earth nin shields (even though that element does counter water). Add on the fact that they have some great heals in there, and they seem okay to me. Just requires some very niche teams, that not everyone can get early on. Plenty of frustration from me at times, but with some patience and experimentation, Water can be pretty great.

Tried Wind out though. They just have an overall lack of control or sustain, so definitely needs something extra to keep beefing it out with other mains who just outdamage and outsustain them completely.