LaMarcus is top 3 in the league in his team outscoring the other while he's on the court, after normalizing for all nine other players on the court!
http://basketballvalue.com/topplayers.php shows LaMarcus to be THIRD in the league in 2-Year Adjusted Plus-Minus, behind only Chris Paul and Kevin Garnett.
This is how they define 2-Year Adjusted Plus-Minus: Plus-Minus results adjusted to account for both the teammates and the opponents on the floor with a player over the course of the season. For 2008-2009 and beyond, the adjusted plus-minus results are based on two seasons of data, with possessions from the current playoffs weighted at 10x, possessions from the current regular season weighted at 5x, possessions from the previous season's playoffs weighted at 2x, and possessions from the previous regular season weighted at 1x. For example, when displaying results from the 2009 playoffs, possessions from the 2009 playoffs will be weighted at 10x, the 2008-2009 season at 5x, the 2008 playoffs at 2x, and the 2007-2008 season at 1x. When displaying results from the 2008-2009 season, the weightings are the same except that there is no contribution from the 2009 playoffs. The results from the 2008 playoffs and/or the 2007-2008 regular season are from a single year (2008 playoffs at 2x and 2007-2008 at 1x). Additional information on how these adjusted +/- ratings are calculated has been published on 82games.com here and here.
82games.com says that Adjusted Plus-Minus "isolates the unique effects of each player on the court. In other words, we can statistically adjust each player’s plus-minus rating to account for the simultaneous impact of all his teammates and opponents."