Mourinho losing once and the fans are going crazy... . In my opinion, Mourinho saved Roma when he came and the entire city knows it so even if you like Mourinho or you don't , he is one of the greatest coach ever who didn't back down from a challenge like coaching As.Roma when the team was in a free fall. Also , they are the champions of Conference League so I suppose they can afford to lose 1 game...
Mourinho is more of an experienced coach than most coaches in the world now, currently the only coach with five European trophies. He's totally on a different level if you ask me, although he cannot compete with some of the best coaches in the world now but judging from achievements and experience he definitely fits in that class as a world class manager. He is doing a good Job at Roma already.