We have been too cautious going forward in the CL, that has been the biggest difference. In the Prem we have bamboozled teams with the movement and fluidity of our front 4, they are so difficult to mark.
Whereas in Europe we are so wary of counter attacks that our creative players have been told to play to a more rigid shape. Watch Silva and Nasri in the prem, the drift inside, swap wings, find space, they are impossible to track. In Europe Nasri stays rigid left, Silva / Johnson stay rigid right.
This allows them to get back in to defensive shape better and make us more difficult to break down, but the flip side is that we are nowhere near as dangerous going forward. I think we were shocked by the speed at which Napoli counter attacked and that was has made us cautious.