Bit harsh on Slutsky I think. Most of these players have had nowhere near as long to get to know how each other play yet. We had such an overhaul that it'll take time to gel like most other teams in the division.
It wasn't long ago people were arguing the formation hardly mattered... now it's being used as a noose for the manager a few short weeks after he's found out what he has at his disposal until January. Injuries haven't helped either. I think Slutsky will get there, but more time is needed yet before we jump on his back.