Raw numbers mean nothing. The fact you're showing Udrih at +17 and Martin at only +2 shows the fallacy in that kind of argument right off the bat.
If you think Beno deserves a higher grade, explain why. Respond to Bricklayer's summary with one of your own... point out why you believe Udrih should have received better than an average plus rating for the evening.
A lot of raw numbers mean nothing. +/- does not fall into this category.
Clearly, when Udrih was in the game, the Kings do A LOT better than when he is on the bench. This is usually, but admittedly not always the case.
Martin is a star, but we've won games against top opponents without him. Others are able to step up. Before Bibby's return from injury, we had nobody to provide what Udrih has been providing to this team. More than just poor shooting, on some nights. More than just a C+ worth.
But that's just my opinion.