agree about some points and he for sure isn't as underrated, as some posters think.
on the other hand, for example, he did play a pretty good Eurobasket alongside Dirk this summer. he was the tournaments #1 in RPG and #1 in double-doubles, #2 in BPG, #2 in FG%, #7 in PPG.
they don't show a PER or efficiency ranking (and I don't want to calculate it), but I'm pretty sure he would at least be top 5 in such a ranking.
if his BB IQ was that low, he wouldn't succeed like that in a FIBA tournament.
bottom line: he won't bring Spurs back to cantender status, but considering our assets a trade for him without give up on Tim, Tony, Manu would be a sensational move. but also considering the kind of move this would be, the Clippers will ask for some more than what was mentioned here. (Blair as the trow in talent) for example the 1st round pick 2012 (what will be a very deep draft) and maybe even another young player like Anderson or Leonard.