re: Top 3 actors whose career inspired you but never delivered up their potential

What has impressed me more about Viggo was some of the behind the scenes extra from LOTR.
That guy is just an awesome man, bought some of the horses to give to cast members. He was retiring, but something brought him back.

His later career roles, working with Cronenberg, and after have been more of what he wants at this point in career. More critical success than box office success.

The Road - The Man
A Dangerous Method - Sigmund Freud
On the Road - William S Burroughs
And his latest - Captain Fantastic had lots of critical praise.

I have always felt that Tim Roth hasn't found his niche yet.