Nobody said they were, or should be happy with it. Nobody said that trying to built and improve your team is a bad thing. It's simply a reality that the playoffs are a crapshoot. The better your team, the more likely you'll have success, but the odds of winning a 5 or 7 game series are still a lot closer to 50% than the top teams would prefer.
If it was Dodgers v. Philly last year, what are the odds that the Dodgers win? is it 55-60%? What were the odds that the Dbacks beat the Phillies? 40%? Maybe the separation is a bit more, but it's not like the top teams have a 90% chance of winning most 5 or 7 games series and 84 win team that limped into the playoffs only has a 10% chance of winning the series. This isn't the first round of the NBA playoffs.