The Lakers have had some terrible luck close in games and are probably a good bit better than their record (their MOV is still +1.1 somehow), but they're imploding right now and Kobe has broken down so they don't have the time for their luck to change. If either Dwight or Pau could move like they used to, they could play together fine and the team would be a lot better, but they aren't moving like they to. If Nash hadn't broken his leg, Kobe might have been able to pace himself and able to still play well in this current and later part of the season, but that also happened. Lot of bad luck hitting the Lakers for once.
edit: Jamison+Duhon aren't NBA caliber.