As much as we've criticised Mourinho, bringing on Ba and that change in strategy at half time was amazing! Lacked that at times last season. But some people might have a point in saying why he didn't do that from the outset, but he reacted to the in-game situation better than his counterpart. So often Sir Alex did many subs like this to change the game (the game at Old Trafford with QPR). Reacting to the in-game situation is an important part of guiding a team to success.