I have no doubt that the players who left needed moving in to help a squad rebuild.
Other than Gollini none of incoming players have played in PL before so we need to give them all time to adjust before we can make any kind of judgement on them.
But I can certainly see why Gil was bought - only about 50 appearances in La Liga so still inexperienced but looks highly skilled and really tries to make things happen. I assumed he was a winger before he arrived but he is more like an Eriksen ( albeit playing in a different way) with his potential effect on the game. Potentially a game changing signing for us.
My general feeling is he changed out older players ( Sissoko, Aurier, Aldereeireld, Rose,Hart, Lamela ) to bring in much younger players ( other than ,26 year old Gollini all others are under 22) who with returning Loaners 20 year old Skipp and 21 year old Sessegnon, really invigorates the squad allowing more energy consuming tactics such as pressing to be more widely used. And by keeping Kane we ended up with a stronger squad than last season - and a squad which can be more easily strengthened next summer as we have fewer obvious deadwood to move on.
Going into this window it was obvious to me we could not expect to move on the maybe 10 players who ideally should have moved on - so with the moves made its a good solid '6.5 or 7 out of 10 for the transfer window.
And Nuno seems to have Dele more enthused and useful as an attacking CM than he has been for a couple of years, whilst our CB duo of Sanchez and Diet have looked far more reliable and capable than they ever looked under Mourhino. Only disappointment so far is Ndombele has not yet responded to Nuno - but 3 substantial improvements out of 4 players is good news