What nonsense are you talking about. You're isolating this Summer for 2 teams whose first team were already very good. Mou never had a good starting point for comparison.
We finished joint fourth and won the FA Cup when Mourinho came. Our squad wasn't that awful to begin with.
Since then, he bought the best player in France, the best player in Germany, one of the best in Italy and a young CB.
The following season, he bought another CB, a premier league winning midfielder and a striker we overpaid to get ahead of Chelsea.
Then he swapped one of the players he bought that didn't work out with the best player in England.
Notwithstanding Fred and Dalot, he brought 7-8 players new players at the club.
How many fecking players does he need to make a fecking difference? An entire new starting 11? I concede he wasn't backed like Pep (well who is?), but that's no excuse for his shitshow the third season. Spurs/Liverpool operate with bigger constraints and their managers have much more to show for than Mourinho did at United. Mourinho downed his tools, period.