I said this in another thread, but I think the fact that Butler doesn't whine about calls to the referees does a lot to bolster his reputation on the court.
He's also a really good player! Dude tilts at windmills like pretty much no one else in the league today - between him and Spo they've got the whole team playing like never-say-die giant killers regardless of his personal performance on the court. That's impressive, because Miami has been massively over achieving since the playoffs started vs. their regular season.