This "Silva TDD sucks" Myth comes after the 1st Chael Sonnen fight.
But hey, Chael's wrestling is at olympic level and he generally power through his opponent to get his double leg takedown while eating punches going in. This is a totally different Takedown from GSP's who uses timed takedown against opponent.
GSP version of (MMA) wrestling work well even against accomplished collegiate wrestler such as Fitch and Koscheck and probably against anyone in the WW division. But against Silva? It would be crazy. GSP has good timing. But Silva timing is at another level. He will probably KO GSP when he try to shoot for the TD.
Not to mention, Silva also manages to stuffed some of Chael's TD in their second fight.
And yes, this is coming from a GSP Fan.