John Denver made the acoustic guitar look a lot easier to play than it really is. He's a legend.
And what about Chet Atkins!?! GOOOOLLY, that man could PLAY!
(I know, Denver and Atkins were not rock guitarists, but they were superb).
The same could be said for James Taylor. The guy is a tremendous acoustic guitarist--as good as anoyone on the scene today. But, of course, he's most known for his songwriting.