I don't think Fergie tried to turn him into a holding player, just an all round box to box midfielder. It was maybe the wrong decision but he has been hampered by injuries and in general bad fitness.
I also doubt his consistency to be a player who can be really effective from AM. You need real quality to play that role and too often Anderson doesn't have it.
Yeah he's been inconsistent for us, I guess I'm just holding onto a slim hope that I had when he joined us after seeing and hearing all I heard from when he was at Porto and was touted to be a great player.