Gooden came in with a reputation as a player with good offensive talent, who could rebound, but was kind of clueless on how to play within a team system. He also was known as a knucklehead.
While he behaved himself as a Spur, his play was that of a player with good offensive talent, who rebounded, but was clueless on how to play within a team system. He was a black hole when he got the ball, and had zero concept of team defense. I don't think this was because he was unwilling; he really seemed to want to fit in, but it just doesn't seem like he's smart enough to "get it."
When the Spurs signed Gooden, to several observers around the country it looked like a sign of desperation from a team totally depleted in talent around its big 3. Based upon the result of the season, I would say those observers were correct. It goes to show just what a steaming pile of dog the roster was that 1) Gooden looked like a real improvement, 2) Spurs fans' perception of talent has been recalibrated so that he seems like he could be a major contributor going forward.
In sum, Gooden has a place in an NBA rotation as a journeyman big man, but not as a guy who gets lots of money thrown at him. That he even has a place in an NBA rotation is more than can be said for the likes of Matt Bonner or Fabricio Oberto at this point.
P.S. R.C. Buford sucks at his job and should be fired.