So because water has a good team I should have to run a counter team. Are we really getting into the meta/counter-meta argument? Because that's when games stop being fun, at least to me before 2.0 I felt I could pick any main and build a decent team with them, now it seems to be all well these people get run so I need CC and the ability to remove debuffs and oh wait there no open spots for the people I wanted to put in my team.
At least this game isn't at the TCG level of BS on deck composition. meta in TCGs is you either run meta or you build your entire deck around stopping the top deck of the season, then new cards come out and you start over.
Anyway, I have not personally played water, I do not know of her strengths and weaknesses, only that after the update her control got a lot stronger and she became more annoying overall. Her team may be squishy if the opponent has the right team and the water user isn't paying attention but mei tenten mabui and main is just a strong team regardless, turn 1 tenten mystery, turn 2 mei and pretty much game over after that.