Allegri changed Conte's 3-5-2 formation during season, which wasn't easy task due lacking adequate players for other formation like 4-3-3, or the one we play right now 4-3-1-2. No AMC like Ozil. Kagawa, Cazorla... and hell there is no goddamn winger to relie on. Allegri can always go back to 3-5-2, has the players for it, even to much for my taste, but there is no point doing such thing.
We can only expect for some crazy team play in CL, if we wanna get some big leap on biggest stage. Regarding the quality we are not that diffrent or stronger/waeker than last year under Conte. Point fingers in Allegri for not making as much better than we were or blaming for draw like one against Cesena is just wrong IMO. If he shot that penaly instead of Vidal, than it be different story.