We maybe needed a LB and could have done with another out-and-out winger. We're still well stocked in all these positions though, and we have Shaw to come back which is a bit of a gamble but not many LBs out there.
Griezmann wasn't the club's fault, Perisic would have been a good addition but wouldn't have improved us greatly overall. I don't think there are many realistic options out there. Some players may have been seen as 'upgrades', but then you might be cutting out a player that has served us well and you might unsettle what seems a solid dressing room. Plus the upgrade would be negligible compared to the price we would have to pay.
I prefer adding a few here and there rather than wholesale changes like City, especially with the ridiculous prices (no idea how Ox is a £40mil player after what he's shown at Arsenal, £50mil for Walker?!) that have become the norm.
Next summer i'm sure we'll look to add a few more as players like Fellaini and Mata will be the wrong side of 30, DDG might leave and we'll need a long term replacement for Valencia. But that can wait, rather than diving into the melee for players like what's happening today.