People really under rate the production he brought to the Spurs as the 4th option.
Sure he wasn't the "picture perfect fit", and sure he didn't average the 20 points he averaged in Milwaukee, but those 20 points per game was impossible to produce with the scarce amount of opportunities he had playing behind the big 3.
Even if he was the 4th option, he still scored in double digits in 58 games last year (more than 15 points per game in 32 outings). And was instrumental in many victories, even in the playoffs.
About his defense, I know he wasn't Bruce Bowen on the defensive end, but the guy showed progress as the season progressed; not so much on the ball, but off the ball; especially in putting in the effort and contesting shots around the rim more effectively than any big man outside of Duncan. I'm not saying he was Dikembe Mutombo by any means; but he was progressively active in this regard, especially in the last few months of the season.
Overall saying he didn't do anything is foolish to say.
Without him the Spurs would have more than likely been a lottery team this past year. Fact is R.J gets too much of the blame for the Spurs' disappointing year. He was not the reason why the Spurs rubbed one out, so to speak.
There were other reasons why the Spurs failed when it was all said and done. Most notably, the lack of having an established clear cut 5th wing ( part of it was Pop's fault) and the lack of interior defense that doomed the Spurs in the end. Not so much Jefferson.
Pop stubbornly made the wrong choice for the team by investing in the wrong players (Mason, Bogans) all damn year. Even when these two players were atrocious for the last 3 months of the season, Pop didn't budge and stubbornly played the law of averages game. In the end, Pop put the team in a very vulnerable position from a depth standpoint by stubbornly giving Mason and Bogans the responsibility as the 5th wing. It made no sense to do this and still doesn't til this day.
As a result of Mason and Bogans maintaining their atrocious status, the Spurs back court and Jefferson were forced way too many minutes and it showed in their 4th quarter execution down the stretch ( even in the Dallas series ).
Pop should have given more responsibility and prepared Hairston or Temple somewhere in the last 2 months of the regular season, when Mason and Bogans were consistently horrid. (Believe it or not, Hairston and Temple had more productive minutes than Mason and Bogans did all season; even if they played less minutes. )
If Hairston or Temple would have panned out as a 5th wing, Spurs could have stretched their bench enough, which would've given Manu more gas at the end of games to " go for the throat", and Hill wouldn't have had as big of a responsibility offensively ( because of Manu and Tony having less but more efficient minutes, and more efficient touches). But Pop was too stubborn to find this out.
By no means am I blaming the year on Popovich, but he certainly could have made different decisions in regards of the rotation that could have put the Spurs in a better position to compete in the playoffs. Many people just point at R.J and blame him. I couldn't disagree more.
Hopefully now Splitter can come in to help the interior defense and hopefully Spurs can find a respectable replacement for R.J via trade ( less likely) or for the LLE. If not then I hope Hairston, Gee and Anderson are ready to contribute.