I think Elvis was up there with Bing Crosby and Frank Sinatra. They both had their own style and so did Elvis. I believe he had what it took to keep you interested but the material made it impossible for him to progress. King Creole was his best in my opinion. When I showed that movie to my girlfriend she said, I forgot it was an Elvis movie. In her words, it was a "real movie". I've been in two movies and a sitcom before I did the Elvis thing and you'd be surprised at what seems like mediocrity acting on TV, is really good acting in person. Elvis had that and then some.
For the most part I believe that at one point Elvis listen to the media and thought he wasn't that good so he didn't fight for better roles. the Colonels reason was, look at how many people went to see G.I. Blues, and how many went to see, Flaming Star & Wild In The Country.
I know a lot of you guys don't agree with me but that's how I feel.