Bosh plays needs to LeBron and Wade who average rebounds pretty well at their position and have a lot of guys who can come off the bench and rebound. Bosh isn't a bad rebounder himself, so lets understand this.
Tiago Splitter is a very good center. He can pass, defend, rebound and has ability offensively. You may to further research him.
Melo is good, but he isn't a PF. He doesn't rebound or block enough shots to play in the interior.
Defensively, it's not his position. Offensively, he has somewhat a speed and skill advantage.
Metta is a SF, out of position.
Martin and Amare are the only real PF's on the team, they're both C level players.
Spurs, Warriors, Bulls, Pacers, Nets, Clippers, Rockets, Grizzlies and T'Wolves easily have a better front court.