The problem with Villas-Boas is his tactics, since when did Bosingwa become a player who's capable of playing for a team like Chelsea? And since when did Ivanovic become a center back? When you have Cahill beside Luiz, Ivanovic as a right back, Ashley Cole as a left back, you basically have an invincible defensive line, but the case with AVB is different, to me, he seems to be flattering with the Portuguese players (And more specifically, Raul Meirelesand Bosingwa).
And I am sure that AVB will be something in the future, but for now, he can't resurrect Chelsea at all. And quite honestly, he wants to turn Chelsea into a Barcelona clown. The team has been playing without a real striker since the beginning of the season, Torres himself is not fond of AVB's way of playing. And I am afraid that this kind of playing will destruct Mata, he doesn't deserve to be playing as a left wing.