A lot of that hasn't just been an issue under ETH.
Braindead fullbacks have been an issue for years.
Lazy wingers who leave too much wide space for midfield and fullbacks to try and cover.
Midfield that just can't hold onto the ball and gets bypassed with 1 straight ball regularly.
Forwards who only like running into 50 yards of space, who possess no clue how to break down a defense.
ETH and how he sets the team up is a problem, but those problems have been evident under Ole, Jose and even LVG. There are huge problems with the players at this club, pace and athleticism is a problem throughout the squad, a lot don't have the technical qualities to be at a top club, others just don't have the brains. Then when you look at the agression, work rate and motivation on the pitch to, it's disgusting that the club has come to this. Bunch of overpaid cry babies who just don't have it in them to fight for their hard earned 300k a week.
Anyway, doesn't matter who replaces ETH, a lot of these players just aren't good enough and they'll stink it up no matter who comes in. Clean slates in the summer when ETH is gone though. 90% of this squad should be earmarked for a boot out the door in the next year or two.