Here's the thing, why oh why if you think you are the best thing since sliced bread, do you say that the team who beat you was a fluke? The Giants beating the Patriots in the Super Bowls wasn't a fluke, it was the better team winning. (FTR: I'm a Pats fan.) Even if you lose by 1 point on a lucky half court heave, the other team was better just by being able to parlay that luck into a win. It's not just about talent, or previous opponents, or anything else, it's about being able to maximize the talent you have, to adapt to the game (ref's call it tight, loose, are erratic, etc.) and use all the advantages you have (underdog cache, favorable seeding, whatever) to survive and advance.
No way, this is being incredibly myopic. The better team can lose all the time. The lesser team might have played better that day or in a few phases of the game, but if you take the original point as fact, you completely discount all important extraneous factors (and you do), most prominently luck, cheating, weather, in game injury, crowd favoritism (UCONN 2014 MSG), inconsistent referees, etc. There's no "adapting" to blown referee calls that hand the other team the game.
It's making up a definition of 'better team' and ignoring pertinent context to fit your narrative.
For instance, in your example, the Giants did indeed outplay the Pats at the line of scrimmage, and this is predominantly what kept them in the game. Then they required a true gift from god (Tyree catch) in order to win, (not to mention a ball hawk Samuel drop). I know the team that won will always think they are the better team, but that's just not always the case.
No one would argue that 1985 Villanova was a better team than Georgetown that year. But they did indeed manage to outplay the Hoyas on one night. If those teams play 100 times, Georgetown wins 98-99. Villanova just happened to have 'their night' when it counted.
Or in a more fictitious example: Say a (superior) team is up by 3 with the ball with .3 seconds left in Basketball. They inbound, time runs out, but the ref calls a phantom foul (where there was no contact at all) on the team that was leading. At the same time, they asses a bench tech for another phantom violation that did not occur. The team that was behind hits all 4 free throws and wins the game with no time left. They better team did not win, as the ref hands the lesser team the win. Perhaps he was betting/point shaving the game and needed the win to cover.
