Most fans probably should ignore Evra views on the club, he is ust really thick and I don't believe he would set any narrative that would be towed by the rest of the ex United pundits. Neville and Ferdinand seem smart for one and I don't expect the likes of Scholes or Keane being too though on Rangnick either, they would just ignore Evra words like he never spoke them.
The narrative am scared of though and that is being painted by the mainstream media is that of Rangnick and Ronaldo not being the best fit for each other. I hope the new boss manages this very smartly and tries to get Cristiano on board with the plan as soon as possible, even if it does not fit his long term vision of how the club should proceed. If not, the plan is dead on arrival because Ronaldo undoubtedly holds massive influence among the current squad of players and if majority don't buy into the plan of Ralf, no matter how good it is, he is never going to be able to implement those plans.
And I doubt the board would back him over majority of the players, because it's simply going to cost them less in the short term anyway. I strongly believe that both Ralf and Ronaldo would make it work though, as they are very smart individuals who do want to win and be successful.