Talented teams miss the World Series all the time. It's a common occurrence. In any one season, you're going to have at least six very good teams capable of playing in the Fall Classic. Simple math tells us that there isn't enough room for all of them in the end. Just one.
So while the 2012 Philadelphia Phillies are unique in the fact that they were so talented—on paper—at the beginning of the season, but missed the postseason all together—they certainly aren't alone.
They're not even alone in their own history. For the simple fact that there are a lot of good teams playing for one prize every season, a lot of talented rosters are kept from a World Series title.
The '12 version of the Phillies are just one example. Including the train wreck that was the Phils this season, here are 24 others.