I don't know why anyone thought Fabregas would be bench warming, he's flat out better than Iniesta, he's the equal of Xavi and is a truly class player. You have to remember how brilliant he's looked for Arsenal, and some of the utter tripe in the squad with him.
Think about how good Ashley Young looked for Villa but the outcome without players to finish or link up with who were good enough, is WAY below what he was capable of. With a quality team around him he looks much better than people thought he was, same with Fabregas.
Hell he's played in three games and thats from starting with zero match fitness, being a touch out of shape, and still having a slight hamstring problem, he's apparently barely trained with them as they "manage" his hamstring recovery. Honestly he'll only get better as he gets back in the swing of things.