I think he's lost his aura. As I said earlier in the thread, I don't view his time at Chelsea as a success though, maybe that's why our views differ? To me, 1 title win in 3 years while ending outside of Europe and costing the club some top players like De Bruyne and Lukaku isn't a success.
If you think that is, then yeah, he can be a success at Man Utd too.
Yet this is coming from a Liverpool fan that was itching to get his hands on the title before Gerrard's famous slip. Winning this league isn't easy and Mourinho had the balls to come back to Chelsea and write off the title in his first season but guarantee it in his second season when he got Diego Costa in. How many managers could boast such confidence in delivering? one poor season in which he lost the dressing room doesn't mean he's lost his aura, Chelsea continued to be poor after he left and many of their fans think they need to spend big this summer.