For me it's the formations, it's like the players don't know what is expected of them and where to play. It's the square pegs in round holes, players playing out of position, Rooney and Sigurdsson on the wings today, not exactly pacy are they. It's the amount of changes per game, six tonight, how are they supposed to get settled get to know how each other play ?
It's like Koeman is trying to shoehorn all his signings in to the detriment of the team. He needs to play a settled, balanced team and if he wants to change personnel, bring them on off the bench.