Old Cee was meh. But since he got buffs and could heal 2 units and increase resistance to lightning ninjas. He made up a lot for proper lightning team who uses chakra as base dmg.

Mabui is only good with 1010 or Pb Sasuke team I think.

With Kurenai's breakthrough i'm sure there will be more people use her in pvp.

TBH everything just depends on main ninja characteristic and playstyle.

i.e. MB isn't a type to play a long term fight. Therefore he doesn't really need heal. That's why he only need immunity for 2 rounds and leech effect. An assassin, go in and out, skirmish.