(Before I start, let me state that I want Lebron and the Heat to win. The man has a monkey on his back the size of two states (Ohio and Florida) and he needs to remove it. “The Decision” wasn’t the greatest thing ever, but the guy was what, 26? I’m old enough to know that 26 isn’t experienced enough to know that the show wasn’t a great idea… but a 26-yo isn’t.)
My “issue” isn’t with his play, but how situations like this will impact his legacy.
Perhaps the man doesn’t care about how he is viewed by later generations, but even his biggest fans have to admit that Lebron throws fuel to the fire by appearing to “take off” playoff games (his last two games with Cleveland against Boston, last year’s record-setting drop off in ppg from the regular season to the finals*), to, of course, The Decision**.
Imagine this conversation from 3 generations of NBA fans talking about the gutsiest Finals performances ever:
Gramps: “Nobody, and I mean NOBODY, showed more guts than Willis Reed starting in game 7 with his fuckin’ thigh muscle about to come off. He scored the first two goals and his inspirational leadership helped bring the Knicks the '70 title.”
Dad: “Yeah, that was great, but don’t forget - it was an inspirational moment, not a playing moment. Yes, Reed scored the first two goals… but he didn’t score again and, IIRC, was immediately sat. To me, you can’t beat MJ in '97, game 5, where he was battling a 103-degree temperature on the way to a 38 point performance.”
Son: “Great performances and inspirational leadership sure, but that’s so old school. What about Lebron, sitting out most of the the final 4 minutes of game 4 in the '12 Finals with leg cramps? He was able to go in and score a go-ahead three before coming out of the game for good!”
I don’t know… there is a difference there. 
*From Wiki: “James’s 17.8 points per game (down 8.9 points from 26.7) in the Finals was the largest drop off in points from a regular season to an NBA Finals in NBA history.”
** As I said, “The Decision” wasn’t the smartest move. On the other hand, if the Decision was to stay in Cleveland, very few people would have complained about the way it was handle.