It's the same old Mourinho Post Madrid style. We play with a defensive full back who does nothing to support his teammates so opposition teams know that our left winger will be fecked if they put a couple of men around him, the majority of our wide play comes from Valencia on the right and every team and their dog knows it and can see the cross coming and prepare about 20 seconds before it's made. Our midfield play relies on Pogba dribbling past 3 players or pumping up a long ball to Fellaini. Our service through the channels is abysmal and often renders the pace of Rashford and Martial useless. Our only freedom comes from our right wing position and teams with a DM can nullify us from there too. You can tell a lot about a team by the amount of team goals they score and we score next to none.
As i said, his single game management like Chelsea can be good at times but his system is unbalanced and broken and selling midfielders in January without replacing them left us in a dire position with very little room to experiment.
It's not like we have a squad full of shite players, we bought arguably the best player in the Serie a, Bundesliga, French league and an amazing defender and failed to put them in a system that played to their strengths.
Yeah i would say that Zidane got it tactically spot on throughout the Champions league, whats wrong with that? He has built a very balanced system for his players.
Guardiola has struggled but he has built an attacking unit that plays some of the best team football the premier league has had for a long long time. His old man defence, that have none of the qualities of typical Guardiola players have let him down. He has a much better foundation going into next season than we do and when they spend another 200 million to bring in fullbacks and a good keeper i fully expect them to mean business.
The left back issue at Chelsea, like with United is not by choice for Mourinho. At Chelsea, he inherited a 36yr old Cole and had to swicth Azi to LB. He brought in Filipe Luis and Rahman but neither worked out. At United, he has tried Shaw, Rojo, Blind but had to settle for Darmian. When Shaw played, he was allowed to go up the field quite often (probably cos he has the pace to recover). That Darmian is poor offensively and lacks pace is not Mourinho's choice
The system is not unbalanced but that getting players of needed quality is difficult. For all the offensive prowess of Marcelo and Carvajal, both struggle defensively. It is rare to come across a player like Lahm who is solid on both ends. If Juve will sell, I wont be surprised if Mourinho is interested in Sandro. Semedo and Mendy for all their attacking abilities are quite suspect on the defensive end. Mourinho is simply limited by the players available to him.
All the problems you listed are primarily due to the lack of quality in the squad. Like I said earlier, you can fault him for not being able to adapt his system well enough to the players available to him, but if you give him the players that suit his system, it would be a different ball game. Apart from Pogba, all the other outfield players are only good or below when compared to the other top teams. They are also a mismatch of manager selections with most not suiting the system that Mourinho likes to implement. A lot of those players would not have been bought by Mourinho.
Zidane is no tactical genius and has a starting XI that basically picks itseelf, and a deepest quality bench in europe that allows him to rest his key players like CR and Modric for the key games.City were playing good attacking football even under Pellegrini, but Guardiola still brought in 3-4 attacking players. It is by choice that he bought only Stones in defence and would rather buy a new GK than a full back. This summer he has brought in another attacker and potentially another GK. Guardiola inherited a better and more consistent squad than Mourinho, but you are willing to afford him more time and money, but have already written Mourinho off.
Mourinho likes to build a balanced team that is solid defensively and potent offensively, which is why he has been successful so often in his career. His four additions have all been solid contributors this season and have been some of our best performers. The team will only get better with further additions.
What I expect to at least be added this summer: #9 (Morata?), #10(James?), LB(?), CB(?) and DM(Fabinho?). With those we would be coming closer to seeing what a Mourinho team/system would look like. Mourinho's system was enough for him to win the PL in a stroll just 2 seasons ago. Give Mourinho the quality players that suits his system and we are very likely to win the PL and go deep in the CL.