What foundation? They've spent enormous sums of money yet their squad is still a mess.
He has spent around £132 million and i agree it should be better but it could be worse. He has done averagely just like his whole tenure at the club. A CF, RW, CM and Cb should be bought in in the summer. Not particularly a mess but still a fair amount of work to be done.
De Gea, Shaw, Smalling, Darmian/Valencia, Herrera/Schniederlin, Martial with a few options such as Ibra bought in with Bastian, Mata, Blind, Rashford as rotation options/Backup isnt that bad. Obviously we wont be anywhere the champions league front runners anytime soon with that but its more than good enough to compete in the league.
Bare in Mind Rio, Vidic, Scholes, Giggs, Carrick, Evra, RVP have all left/retired in the last 3 years and he has to rebuild an entire squad. City have spent alot more than that in the same period of time and haven't had to rebuild the main core of their team.