Yes I would have loved to watch Wade Barrett vs Sheamus 5 PPVs in a row
No one single guy should have gotten the push Del Rio has gotten. What they are doing with him now, should have happened long ago. Feud with non-champions until your last feud with said guy is dead and buried, or a new champion is crowned.
As for 2011, Barrett didn't have that swagger he had in 2010, he looked like he just didnt want to be there, and I definitely see that come out sometimes during his matches. elbowing a guy in the face apparently isnt as exciting as he had hoped. Del Rio winning the WWE title at SummerSlam ruined the CM Punk pipebomb storyline IMO, and killed what could have been a now 400ish day title reign by Punk. Del Rio winning the title was like Vince's slap in the face for Punk speaking out (or in storyline it was supposed to look like that, idk)
Theres no saying if Barrett had gotten a "it is my destiny" storyline that he would have been in Del rio's position.