Everyone hates Lebron and blame will always go towards him. But this series really exposed all the flaws MIA had all season long. They don't have good bigs. I think Joel Anthoy more or less got benched the past couple of games. They don't have a reliable point guard. Chalmers may have hit some big 3's but he was an unwanted guy in MIA prior to this year. House had to come in and play because Bibby was useless against JJ and just in general. They still haven't learned how to play together with Bosh not getting touches.
Basically you're looking at very weak 1 and 5 positions (remember this was were the C's were supposed to dominiate MIA?) along with very good 2, 3, 4s, but not good enough to cover the 1 and 5 flaws every night.
The Celtics had the same problem in 2008, at least that's what people were saying... "can the Celtics win a championship with Rondo and Perkins in the starting lineup." Remember that? I think the Heat's Big 3 didn't play well enough. Look at what they did in 4th quarters, especially Lebron. The Big 3 is supposed to carry the team to wins, like the Celtics Big 3 did. Although Wade and Lebron are more talented than the Celtics, the Celtics Big 3 played better as a group than the Heat's Big 3, imo.
Their supporting cast should have been just as good or better than the Celtics supporting cast in 2008. The Celts had House, PJ and Posey. The Heat have House, Chalmers, Miller and Haslem.
The Heat's Big 3 just couldn't get it done when it mattered most.