In my experience, stopping Mabui and/or Tenten on Round 1 isn't always effective. If you chaos or immobilize Mabui right at the start, she's probably going to be healed by the Water MC during that first round if she took damage and then she gets to do her Heal and give chakra anyway, allowing Tenten to assault your team.

My solution for fighting Mei meta was using SN, Iruka, Guy with neurotoxin and poison + Chakra blade and dog summon. Usually since I was faster than their prio 1 Mabui, my SN would combo her and then she'd be poisoned and chaosed right then and there, unfortunately the problem arises as I mentioned earlier, MC will heal Mabui and even though Mabui missed her turn, she'll still get to Heal and then give chakra to Tenten even at the very end of the round. So controlling Mabui isn't reliable, controlling Mabui or Tenten was never a reliable way to beat that team in my experience due to all the healing.

If we're talking in terms of even power. The biggest enemy of the Mei meta team I've encountered (Since I now use that Mei team myself) is a Regular Gaara + SN wind team, the Mei team has no interrupt in the first round unless the Gaara is positioned in a way where Mei or the Water Clone can water whip him, which is a game of chance, and even if the Mei team is faster across the board, it doesn't matter if you shut down SN or kill the wind MC or whatever else, Gaara can remove 90% of an entire team's health in one go, his damage is that unbelievable EVEN if he is significantly weaker, it's really crazy.

But I've fought plenty of control teams that targeted Mabui or Tenten or whoever else trying different strategies and it usually doesn't work unless they have some huge damage dealer or a means of killing very quickly, which requires power.

Lightning teams are pretty hit and miss, I've beaten plenty of Lightning blitz team that were anywhere between 5-10k power stronger than me but I've also lost to some that were at my power or below, it's entirely about positioning and some luck.

Now, if you have Initiative over another Mabui, Mei Tenten water team, the team is incredibly effective at beating it's self, most fights in Arena I've had with that team VS the same team are very, very one sided in some cases winning with full HP.

I would like to point out the water MC heal costs 0 chakra. But I would certainly believe a lot of people got that team and just run it on auto, which causes it to become incredibly predictable especially VS it's self. If you play manually with that team AND you have initiative over the other player, they usually can't do too much to fight back against it.