I really dont get too enamored with guys who score BIG points on bad teams with not even as much as a legit #2 scorer. That means he has the green light to gun! And honestly speaking if Ray Allen was on that poor Sacremento team, he may average more points than Martin while being more efficient if he got the same amount of touches * shots. Ray is the better player but you can only do so much on a team where you are only getting 15 shots a game tops. Pierce is only getting 12-15 shots these days because we spread the wealth. So lets just keep Walter Ray!
I really doubt Ray is better than K-Mart at this point in his career...maybe a bit better at catch-and-shoot 3 point shooting...and probably a bit better at free throws. K-Mart can get to the basket and the free throw line much better than Ray Allen.
While he's the #1 scoring option on a Sac team with no real #2, he's also a very efficient player. He has had very good shooting % the last few years, and good PER numbers as well despite having such a high usage rate.
By contrast, for example, Tyreke Evans is not nearly as efficient and has a much lower EFG% despite taking over Martin's role on the team.
The only real knocks against Martin are that he tends to get injured for at least a couple months each season and he isn't known for being a very physical player, especially on defense. He's just very fast and agile - good at getting to the basket, drawing fouls, and shooting. He's a finesse player, which is why he plays SG even though he's 6'7'' and very lanky.
I believe Martin would put up at least 20 points on whatever team you put him on, unless he were really surrounded with a ton of scoring options.