Yep, the teams may have been close in talent, but hands down the Heat had the best player in the series and to a man the Heat had more smarts, guts and hustle than the Thunder. And Spoelstra outcoached Brooks (best you could claim is Brooks team just didn't execute or listen to him). Ironically people are drawing parrallels between the Heat championship and Kentucky's but they are actually much more opposite, HUGE factor in the Heat's win was experience.
An underlooked factor in LeBron's incredible performance is getting Durant into foul trouble to help win two games and simultaneously wearing down Harden in those games. And in game 4 when Durant switched to Chalmers, Mario had one of the best games of his career. Game, set, match LeBron.