Wish that I could disagree - you've made some exacting points. HOWEVER, in all fairness, was Elvis ever given a
real shot at trying to perform? Did he ever get the impression that he was going to be taken seriously, and therefore should learn/perform/grow & work his backside off? I'd compare his first roles to those of any prime actor in their first roles. Very few actors had an unbelievable shot out of the cannon as far as First's in acting performance. George Clooney in "Roseanne"? C'mon, he wasn't winning Emmy's there.
And Elvis knew from the very titles of his next movie what not to expect.The formula was established and he was rarely given the opportunity to shine. Even in those films where he would have gotten a chance, the scripts were carved to little more than fluff. Then, really, we fans must take the blame. We booed [well, not me, I was too young at the time to be a critic

] when he 'dared' to make a film that wasn't happy and full of songs and women. Had a movie like Wild in the Country been given better box office money then maybe Kid Galahad could have been the forerunner to the Rocky movies.
There were a lot of factors to look at with Elvis' acting, but we're just having fun here and now then how about Elvis in
Underseige? His karate would have certainly come in handy then.