PDivvy had a much better South African team to coach than Meyer.
He had players like Victor Matfield, Fourie du Preez, Jaque Fourie, Heinrich Brussow, Bismarck du Plessis all at their peak under him, and South Africa should have really been New Zealand's closest challengers to the RWC in 2011.
Yet he still managed to get the team to underachieve, despite having those players.
And now Meyer is having to go through a rebuilding phase without those players.
Of course if you take Matfield, du Preez, Brussow (at his best), Fourie, Bismarck and Burger all out of the side, then it will be weaker. That's over a third of the side, and nearly all of the side's best players.
If South Africa had a good coach and selector during the 2008-2011 period, then South Africa would have been challenging the All Blacks much harder.