Another way to look at it is that he got 198 points (over the course of 2 seasons) with no real LB (since Mendy was injured, and for the same reason, he has a RB playing as a LB this season). As for the midfield not having a real balance, that's totally subjective and depends on the midfield combination a coach chooses. As for the striker issue, they've never had problems scoring loads and creating except for this season.
As from how much is a transfer considered a "BIG" transfer? In today's football, i don't consider a 50M transfer to be a big transfer...
City and Guardiola have played their part in making 50 millions transfers the norm, and it’s undeniable that he has spent a fortune.
The balance in the midfield is clearly an issue, as he just doesn’t have the players to play the way he wants. It remains to be seen whether a new coach can find a balance with the players they have, but it looks like a lot of 8’s and 10’s to me and no real standout candidates apart from de Bruyne. It’s an issue that needs addressed.
He played and won big for two seasons and it looked very impressive at times, but, again, expectations are risen and demands are greater when you have such a heavy spend and a squad that no one could come close to.
The only reason he doesn’t have a proper left back is because he chose the wrong options, wasted money and failed to find a suitable option. It’s the same thing with Walker. He has no other option because it’s another example of where he has overspent and failed to produce competition for him.
The fact is, that he has spent over 800 million on players and there are issues in the squad. That just shouldn’t be the case when you started with such a strong squad to begin with. He has spent more than anyone else during that period and has wasted hundreds of millions of pounds.
For all his spending, there are very few outright successes, and even players like Mahrez, who have contributed, are now, not even making the squad.
On top of everything else, he has totally failed to use the much touted youth system and hasn’t brought though anyone bar Foden in his time there. In fact, he has watched a number of talents walk away from the club and not sign deals.
There is a lot be praised, but there is so much to be criticized too, and I think you invite that criticism when you have as big an advantage as he has had.