No, no he's not.
Newsflash: Kevin Martin is not THAT good. Not universal positive good. In fact the one thing he does is highly disruptive (shoot) and it requires careful planning to make it work. The Lakers would have no use for him. Neither would Atlanta. He'd mess up the surprisingly good thing they have going in Memphis. Etc. Its not a universal thing. Right place, right fit, yeah -- if you need what he brings and can compensate for his deficiencies, he;s good at what he does. But wrong place and wrong fit and they, and he, are going to have similar problems to what is going on here. He needs the ball to shoot, a lot. He does not know how to play basketball otherwise. Been getting the ball, a lot, all the way back to high school at least. If that ball is already spoken for, its a bad fit. Furthermore Kevin a) does not handle the ball well enough to be a PG, and b) is too scrawny to be a SF, so is really a one position player -- pretty much a pure SG. So again, if those minutes are spoken for, it does not fit. Kevin is neither good enough nor versatile enough to be a universal, and his speciality is the one thing you actually can have too much of -- scorers, guys who need shots.
People have just been fed this ridiculous hype about Kevin so long by the Kings advertising staff when they ahd nothing else to seize on that it long since left reality in its distant wake.