Miami's at the forefront of basketball analytics. Lost in LeBron's amazing season is how well they've constructed this team. They really, really understand what is and isn't a good shot (for example...LeBron's comments about catch & shoot 3's vs. off the dribble 3's is an important distinction that's been made in the last couple of years in the world of analytics. There's a BIG difference in percentage between the two) They've de-emphasized post play and emphasized the drive & kick game, which fits their best players perfectly. Nobody is in LeBron or Wade's way when they go to the hoop, and if the defense collapses, you have great spot up shooters at every other position.
I think the right way to defend Miami is a Strong Side Zone with pressure on the ball, forcing baseline. The Lakers and a few other teams were using this more a couple of years ago, but I haven't seen as much of it lately. This picture kind of shows what I mean.
Miami likes to start a lot of their sets on the wing, similar to where Roy is right here. (except Miami smartly starts behind the 3 point line instead) In Miami's offense, they have a 3 point shooter on the weakside wing (like Portland does here) AND a guy in the weakside corner. So this picture is basically what Miami likes to do, except instead of having that guy cutting down the lane, he'd be standing in the opposite corner. 4 guys beyond the 3 point line, with Bosh being where the big man is in this picture.
What Miami does to combat this is they have Bosh set a back screen on that white dude (Udrih?), and LeBron uses his size to get the skip pass over to the opposite corner. This screen shot from a couple of days ago against Orlando kind of illustrates what I mean. Orlando was running SSZ against them, LeBron (I think that's him) had started to penetrate, Bosh set the back screen, and Allen had a wide open 3.
Going back to the first picture...because Orlando's SSZ is all jumbled up here and the Phoenix picture is what it's SUPPOSED to look like...Bosh would be screening the big, who's the one with the closeout responsibility on that weakside, corner 3. I think that the way to run SSZ against Miami is to cross the weakside responsibility. So in the Phoenix picture, it would be Nash that closes out on the corner 3, and the big closes out on the weakside wing. Much, much harder for Bosh to backscreen that. I'm curious to see if anyone does this in the playoffs. Miami will pick you apart with weakside corner 3's if you don't change up your weakside help responsibilities.