Chris is right on this.
This is year 1 of an experiment that will no doubt yield many big moments and a ton of wins - in the regular season.
They will have their issues this year because, a) Spoelstra doesn't know how to coach these guys, b) The big-3 there don't quite understand eachothers' games the way they need to, and c) they haven't had a full season + and offseason to correct the unforseasble circumstances that arise - such as James Jones making Mike Miller expendable.
The Heat will have one of the top 3 regular season records in the East for the next decade - from there it's just about hoping you've found the right pieces around the big-3 in Miami from year to year.