Personally think we had a good window in terms of standard of players, just not convinced we bought the players we needed, or not convinced Pellegrini has figured out how to get the best out of everyone given their favoured positions.
Otamendi 7/10; shown how good he can be, but shown how bad he can be. Very much like his passing range, if he can get drilled & build a proper partnership with say Kompany then I think we should have a very strong CB partnership there.
Delph 8/10; value for money & work rate. Certainly doesn't have the ability of a Yaya, but always puts in a shift & is far better on the ball than I thought he would be.
KdB 8/10; don't think we've even come close to figuring out where to play him or how to get the best out of him, but so very clear what he can bring to a team & only 24. Absolutely wasn't a player we needed this season for me, unbalanced the team & such, but in terms of his potential & what he could do in the right system he has to go down as a great acquisition for the future.
Sterling 8/10; something we needed, pace & unpredictability with a good workrate. He's only 21, you see everyone post on here "play the youth guys pellegrini" yet getting frustrated at Sterling, well Sterling is exactly what you'd expect from a youth player, ups & downs and can be frustrating to watch, but very clear he adds a new dimension to our side when he's in there. For me he's been one of our best players this season.