As mentioned he put Miz over and has done the same for Punk last year. However that i don't mind as WWE needs to create new stars desperately (AKA why Rock/Lesnar are needed so bad) so WWE taking a chance on younger guys i can take.
Really? He put over Miz?? When? Surely you don't mean losing to him at last years Mania. The WWE made it clear for all to see Miz wasn't in Cena's league and The Rock pretty much handed Miz the win. It didn't do anything for The Miz as it was all about Rock and Cena, remember Rock crushing Miz and standing tall to end the show. And just incase you weren't completely convinced, I'm pretty certain we got in to double figures for the number of times Cena beat Miz in the subsequent months.
I think The Rock match was the first time for a long time he cleanly put someone over. Even with the Punk thing, where Punk was meant the be THE next big thing, they made it obvious to all who could see Cena had the match won, but for Vince showing up and Cena doing the "Right thing", it was his match. And a month later, Trips didn't see his foot on the rope....
The Rock match was the first time they actually admitted, Cena wasn't the better man, which was surprising. The Miz and Punk feuds though, nah....