But some of the people you cite as being pushed either don't have the credibility to be big stars and draws (Lashley) or have lost credibility in the eyes of the fans for a variety of reasons (Booker by having been pushed as being weak in the past, Batista and Orton for their injury proneness, and Cena, who they really should've turned heel a year ago when he was getting booed out of buildings). They only guy you mentioned who has a fair degree of credibility despite himself is Edge, who, for all his faults as a human being, is for my money one of the best workers on the roster. Vince had the opportunity to make a big star out of Christian (remember when the MSG audience nearly gave him a standing ovation, despite the fact that he was a heel?) but he blew it. Kurt Angle was another blown opportunity, as the fans love Kurt, but Vince seemed to underestimate his drawing power.
Bottom line- it's Vince's company; the fault ultimately lies with him. He pushes whoever he or Stephanie likes, to hell with the fans, and relies to much on writers who've never been involved in the business until he hired them.