Based upon total Win Shares, Win Shares Per 48 and PER, LeBron has already had one of the top 13 playoff seasons of all-time.
Should the heat win the title, it is very likely that James will beat Tim Duncan's record of 5.9 Win Shares in one playoff season. It is also very likely that James will have a higher PER than either Duncan (5.9 WS) or Dirk in 2006 (5.4 WS).
If the Heat wins 4 games, you would have to assume LeBron chalks up at least 2 Win Shares over the course of the series, giving him 6.8 for the playoffs, shattering Duncan's mark. Combine that with a 30 PER and you have what will most likely be the best playoff performance of all time.
So, LBJ haters, you better start rooting REALLY hard for the Thunder.