I don't remember ever seeing an infield fly called on a ball that deep, and I know I've never seen one called that late.

A lot of talk about the blown call, has taken the focus off how poorly the Braves played. They made 3 errors, which lead to 5 unearned runs, and left 12 men on base.

Re ; lateness of the umps call....I have always thought that ump has to wait until the ball is close to the top of its flight in order to be sure it is a "fly ball" (subject to the infield fly rule) and not a line drive. I believe the ump here made his call soon after the ball reached the top of its flight and started down
However, I agree that the spirit of the rule is distorted when the call was made under all the circumstances present here.
But it s the ump's judgment in the last analysis. MLB was right to deny the protest

From the Official Rules of Baseball (which include comments on specific plays as seen here):

Rule 2.00 (Infield Fly) Comment: On the infield fly rule the umpire is to rule whether the ball could ordinarily have been handled by an infielder—not by some arbitrary limitation such as the grass, or the base lines. The umpire must rule also that a ball is an infield fly, even if handled by an
outfielder, if, in the umpire’s judgment, the ball could have been as easily handled by an infielder. The infield fly is in no sense to be considered an appeal play. The umpire’s judgment must govern, and the decision should be made immediately.

Two things to note - 1) an outfielder CAN make an Infield Fly catch and 2) it is a JUDGMENT call, not one that can be appealed. Is there ANYONE who doesn't believe Kozma should have been camped under that pop-up?

It was an awful call showing really poor judgement by the umpire. At Fenway that ball is nearly on the warning track. When a call is so silly that Atlanta fans - some of the least reactive fans I've been around - go crazy, it's a bad call for the ages. However, the Braves lost because the defense of all things let them down and the offense continued to do what it did all year long, fails to score RISP. Medlen threw a pretty good game, his mistake on the home run ball is inconsequential if the Braves deliver at even the league average with RISP and make the simple plays on defense.
Just as bad was the very late time out call that allowed Ross the second chance with two strikes that resulted in the two run homer. You simply can't make that call so late that even the man asking for time out swings. Bad umpiring in both cases
Fredi Gonzalez made two really bad choices; the suicide squeeze with Freeman who runs slower than molasses in winter in third and playing the infield so far in that it was impossible to stop the routine ground ball Durbin induced. Playing the infield in rarely works and is particularly silly against a team that makes contact. I know it's a by the book thing but someone should rip that page out of the book.
The Cards took their chances, drove in runners when they had the opportunity and played good defense. They deserved to win the game.

Watch the video in slow motion. As the ump starts raising his hand, Kozma backs off from the play. Right, wrong or indifferent, it appears to me the ump's call of infield fly made Kozma believe Holliday was calling him off. If that is the case, the Bravea actually got a break from the call. Instead of first and second with two outs, they now have second and third with two outs. Why is no one mentioning in the media talking about this aspect?

I believe the infield fly rule was properly called. Kozma, using ordinary effort, was certainly in a position to catch the ball. My viewing of the play, and replays, indicated to me that the umpire called the infield fly as soon as Kozma waived his hands, indicating that he was going to catch it. That he, almost immediately, gave way to the left fielder, and because of poor communication with the left fielder the ball was not caught, does not change the rule or the call.

When Holliday is involved on a fly ball in a playoff game, nothing is routine. RULE j-56 in the unwritten rulebook.