Underrated/underseen Actors?

Dick Miller. I love that man, everything he does, no matter how small the roles might be, he lights up the screen, and some of the random lines are hilarious.
Just saw him last night, in a terrible horror film Dr. Heckyl and Mr. Hype (1980), and Miller probably has less than a minute onscreen, yet his lines are what I remember the most.

Once again, his appearance as an ungrateful garbageman is the stuff of comedy gold, and I was almost expecting him to shout out something in the line of his The 'Burbs part: "LOOK AT ALL THIS GARBAGE!"

Anyway, I am sure he has done bigger and who knows, some leading man roles as well in his long and impressive career, as one of the most likeable character actors, who at a certain period during the 80s and early 90s, seemed to be in every cool and enjoyable movie of that time.