Were The Red Sox Robbed?

The Boston Red Sox were defeated 5-4 when a Cardinal player was awarded home plate on an obstruction made by the third base umpire in the bottom of the 9th inning.
After looking at the video, clearly an obstruction occurred.  However, I can see where the Red Sox are mad because not only was the call ended the game, but the umpire just quietly made the call, perhaps hoping that no one noticed him call it.  Normally, when an umpire makes a close call, especially at the end of the game, they are taught to sell the call but this ump not only didn't sell the call, he seemed he was unsure of the call and had to convince himself he made the call correctly.
In the end, the call was correct, at least technically.  But should it have ended the game in Game 3 of the World Series?  That's a tough one and the umps are screwed no matter how they called it, but I think the call should have been a no call, mainly because there was no guarantee the runner would have scored on the play- it would have been close but...