There is plenty, plenty of evidence that supports the playoffs being a crapshoot. I don't make statements such as this without having researched the topic. I have posted this stuff before. The biggest piece of evidence, IMO, is the fact that nothing about the regular season correlates very strongly with postseason wins. That is the very definition of crapshoot.
I will grant you that with the latest addition of the wildcard playoff game, there might be changing data. But if I had to guess, I'd say there won't be. Posting data from 8 postseasons tells you nothing.