But essentially no less sophisticated (apart from the clever use of technology that modern productions can employ!) than the films and music videos today's "stars" turn out! :)

Indeed, melodeonboy, I had the exact same thought. In fact, without wanting to sound curmudgeonly, if we consider the social and cultural environment of his and Gracie's target audience 75 years ago, they were a great deal more sophisticated in that they never attempted to talk down to that audience. Always looked them straight in the eye, as it were. That's why it worked.
I don't think he could be described as a great actor though. He makes Will Hay look like Richard Burton.