I guess some of the teams are just sour graping. Anyway, I don't see a big deal with Miami's big 3. It seems Miami just wants to build a dynasty same as Celtics, Lakers, Bulls did before. And 3 players are not enough to win a championship they need good role players and a good coach too. It's too early to say that they will dominate
Below are some of the big 3 that won championships.
Boston: Garnett, Pierce, Allen
L.A.: Bryant, Gasol, Artest
Chicago(90s): Jordan, Pippen, Rodman
L.A.(80s): Magic, Jabbar, Worthy
Boston(80s): Bird, McHale, Parish, D.Johnson