People will obviously point to the finishing, but for me there's so much game intelligence missing from the current team in defence and midfield.
This is passes out from the back, deciding when to make a run and take on a man, crossing it at the wrong time, not crossing it when you should be and the other team is exposed, passes down the line when there is an overload, the final pass to the striker when other defence is outnumbered, closing down, when to foul a player and when not to. We look easy to beat on a 1 v 1. It is common to see 1 player even take 3-4 of ours out of the game without him being fouled or dispossessed.
There are a litany of things not being done the correct way. Very simple things that top sides should not be doing.