Just doing some quick data scouring across the internet further shows how effective that starting 5 has been.
82games
The starting unit is a +35 total over 104 total minutes played. Its outscored its opponents in 5 games, and been outscored in only 1 (Win-Loss). Its win-loss percentage is .83. Per 36 minutes, its expected to be +12.12.
Just as a comparison...
(+/-, +/- per 36 minutes, W-L, Win%)
Miami: Chalmers/Wade/Battier/James/Bosh (+46, +10.35, 8-2, .80)
OKC: Westbrook-Sefolosha-Durant-Ibaka-Perkins (+46, +5.18, 11-9, .55)
OKC w/Martin: Westbrook-Martin-Durant-Ibaka-Perkins (+26, +7.26, 12-7, .63).
NYK: Felton-Kidd-Brewer-Anthony-Chandler (+53, +13.63, 7-4, .64)
Teams that qualify for the playoffs in the West who don't have a better 5 man unit than the Kings' starting lineup.
Best linuep below with assorted statistics. I picked the units kind of on what I expect the team's best lineup to be; one that gets significant minutes, and one that would expect to finish a game. (+/-, +/- per 36 minutes, W-L, Win%)
Warriors: Curry-Jack-Thompson-Landry-Lee (+19, +7.30, 9-5, .64)
Timberwolves: Ridnour-Lee-Kirilenko-Love-Pekovic (+9, +3.90, 3-2, .60)
Jazz: Mo.Williams-Foye-Carroll-Millsap-Jefferson (+11, +6.39, 3-1, .75)
Nuggets: Lawson-Iguodala-Gallinari-Faried-Koufos (+20, +3.2, 8-9, .47)
Playoff teams with arguably comparable/better 5-man units
(+/-, +/- per 36 minutes, W-L, Win%)
OKC: Westbrook-Martin-Durant-Ibaka-Perkins (+28, +7.24, 12-7, .63)
Spurs: Parker-Ginobili-Green-Diaw-Duncan (+25, +30.61, 6-2, .75)
Clippers: Paul-Crawford-Barnes-Griffin-Jordan (+54, +38.72, 10-2, .83)
Memphis: Conley-Allen-Gay-Randolph-Gasol (+79, +10.83, 10-4, .71)
Its truly astounding that ONLY the elite teams in the West have comparably successful five man units than our starting lineup. The problems are not with the starters. The problem is the rotation and bench play (and I guess you can include injuries, suspensions, and foul trouble to that list). Thats on the coach.