You're absolutely right, the Thunder are not playing well at all... but the Heat aren't playing much better. They really aren't.
I wouldn't care too much if the Heat earned their championship, but they haven't earned it. This series and the Boston series have been atrocious games, and even though both teams are playing terribly, one team has to win.
The thing I am most upset about is Miami's game plan, is that it includes taking advantage of the refs. Let's ignore how the game has been called. Let's ignore my opinion of one sided refereeing. It is impossible, literally impossible, for someone to argue with a straight face that the Heat aren't actively looking for fouls whenever they can get them. Every opportunity, fair or foul, they can eek out a whistle... they take it. Even at the expense of playing the game properly.
I am disgusted that a champion can possibly be crowned by using fouling as part of your game plan. I'm not talking about situational fouling. For instance if someone is in foul trouble, you go attack them. That's fair. But to look for fouls on ever.single.possession to the point that it is part of your game plan ruins the game itself. Fouls were put in place so the defense couldn't take advantage of the offense with over the top physical (dirty) play. Fouls aren't designed so that the offense can take advantage of the defense.