I don't know about that. Reading the Reddit AMA with Harrison Ford, it seems he enjoys making films that entertain people.
He also isn't terribly sentimental or nostalgic. He doesn't own many props from the films he's been in and the berevitiy of some of his scenes ("I love you", "I know" and shooting the swordsman in the first Indiana Jones) seems to be directly tied to Harrison Ford cutting through the bullshit and getting to the point. I wouldn't say he's a phony, he's just not into all the fluff surrounding his characters and I think that's what actually draws people to his performance.
e.g. Our intro to him in Star Wars is a business deal, followed by shooting an alien that talks too much. That's Harrison Ford. That's what he does, that's why people like him and that's why Han Solo saying "May the force be with you" is such a big deal; Han Solo (and Harrison Ford) do not care about the mythos and the jargon while everyone else is falling head over heels for it.
In that regard, he's probably one of the most authentic actors in Holly Wood.