Its all because of the timing of push. Look at recent times how many times they have not pushed a guy properly when he is getting over, for example:
-Matt Hardy, when he returned
-Muhammad Hassan, there was controversy but they could have kept him in some form
-Christian, enough said
-Kane, countless times and over his career
-Chavo Guerrero, worst timed turn
-Paul Burchill, speaking of?
-Rob Conway, what was with the burying of him
-Tatanka, he was getting decent reaction, until they make him lose to likes of Miz, at least it looks like he is going to get a heel push, but we know what happened last time he was heel
How can Shelton get over with not even being on the lower card or in any storylines? The only time recent I can remember when they ran with fan reaction recent is Batista. Why do the even bother pushing some guys like Umaga with no build up? Sure he is a good powerhouse, but so boring, Estrada is more interesting even. Why not just bring back the WGTT, wth is Hass doing with Viscera anyways?