Just reading some of the Watson arguments, the reason Watson is #3 and not down the order is because he's a boundary hitter and he needs that hard ball to assist him in hitting boundaries, also the fact that Australian cricket as a whole has a whole heap of openers and a whole heap of middle order players, noone really stands out and hits you in the face as a solid #3
For so long Australian cricket was blessed as we had not only a good #3 but one of the best batsmen in the world in Ricky Ponting, ever since then we haven't been able to fill that gap. We've lost other great players too but they've been in positions that have been filled due to having players good enough to do a job in that position. We just lack world class #3 batsmen and as such Watson is the scape goat, it could be anyone failing in that position but it just happens to be an injury prone Shane Watson whose best runs have been in situations that weren't really high pressure situations.