Some of the tactical issues are, but there are deeper rooted problems.
There is a malaise at the club that seems to have swallowed much of the club. You only have to look at the deterioration of someone like Aquilani (or how good a mediocre player like Candreva looked when he joined last season).
Even Buffon and Chiellini seem to be falling into the trap.
The only solution, as far as I can see, is to get a coach with a big, dominant personality and a couple of players with a similarly strong mentality.
Juve used to be okay because they had Buffon, Chiellini, Nedved, Camoranesi, Zanetti, Del Piero and Trezeguet, who could all be trusted.
Now there are pansies like Aquilani meandering around the pitch like lost souls.
People will look at technical ability (as they always do), but getting players with the right mentality is more important.
Who, apart from Del Piero and Chiellini, of the current players will try to take control of a game when things aren't going well?
Melo may be an exception, but most of them just disappear.