Its much easier to have a manager that makes the same sorts of decisions that you think you would make. Then when things go pear-shaped it must be the fault of the players, not the managers. But if you dont understand his decisions it must be his fault

IMO managers are there for 2 things:
(1)building a team
Rafa has been A (maybe not A+) in the transfer market, bringing in some real quality (Torres, Masch, Agger, Reina, Alonso, Crouch) with most of them young and buying heaps of players for our long term future in the reserves.
(2) employing good tactics and improving players
Tactically he is reveared as a genius by the football world (his record speaks for it self) and likewise by his players and people around the club. Torres time and time again gives credit to Rafa for improving him as a player, and preparing him with technical info on each team's defense. And he is not the only player to credit Rafa with helping him improve in leaps and bounds.
These are the things that Rafa CAN change, and what he should be judged on. IMO he has done more then good enough in my eyes for him to warrant long term confidence. I believe that poor performance by the team is not just the manager's fault. The weakest area of our team is some of the players we have wouldnt make it into the starting 11 at Chelsea or Man U and not our manager. As far as I am concerned that is our problem.
*I am not going to get dragged into a rotation arguement as its been done to death. But yeah, I am fine with Rafa's rotation policy. IMO he rotates when its broken, and he generally doesnt try to fix it when its not.