It's a slightly weighted crapshoot IMO. Smart people have been trying to figure out the secret formula for winning in October for years and pretty much every theory has been debunked. Great pitching? Sounds great until you remember the 90's Braves. Great hitting? the 90's Indians are one of many examples of great teams that went cold at the wrong time. 2001 Mariners won 116 games, led the MLB in RS and RA and barely got past the ALDS and lost the ALCS in 5. In 2008 there was a lot of talk of a secret sauce that involved power pitchers, good closer and good defense as being the key to winning in October. I believe the Cubs were well regarded in all 3 areas and got swept out of the NLDS. But every time I am convinced its a 100% crapshoot, the 90's Yankees, 2010-2014 Giants, even the stinking Cardinals of recent years seem to have succeeded more often than you'd expect in a crapshoot while teams like the 2000's Twins and A's have failed more than you'd expect to in a crapshoot. So I think there are small things that give a team a higher probability of winning playoff series, but even then its just a weighted crapshoot.