I agree with a lot of what people have said in this thread about the best games, Seawitch, EBD, Fathom, etc. I can't pick just one and i will add a couple of my favorites that haven't been mentioned:
Black Knight - spinner ramp shot, voice, dual level playfield, magnasave. I can't believe no one mentioned it yet.
Solar Fire - tons of features, drops, momentary magnasave, my favorite dual level playfield
Barracora - I love the stacked lane change, in order drops and the u-turn shot.
if we are including rare games...
Cyclopes - pop bumper by flippers, drops, targets behind drops, spinners, captive ball, deep rules for the era
Looks like I am a big Roger Sharpe fan!