Dwight may not be a dominant offensive player but he is dominant defensively. He wasn't healthy until the All-Star break and showed how good he is (a 22 point, 14 rebound, 3 block guy with 7-10 altered shots a game). This is despite often being forgotten on offense because the coach can't run a system that works the ball into the post.
Fans that think he's terrible are short sighted. Bynum was a black hole when they got the ball into the post. He was inconsistent on offense and sat out this entire season. Of course I would rather have Lebron or Durant than Dwight, but Dwight is still in the top 5-7 in the league of guys you'd want to start a team with.
In the Spurs series he had no chance of dominating. Every time he touched the ball he was double, triple, or quadruple teamed. At least when teams did that to Shaq, he could kick it out to Kobe, Fisher, Horry, even Glen Rice, instead of Darius Morris and Andrew Goudelock. The fact that he even garnered that much attention tells you something.