I gave this a little thought.Like a lot of you,I think a lot of the old guys should have won a title,Johnson,Turner,Roberts.etc.And I think that both Davey Allison or Tim Richmond would have most likely won one or more as well.
But still I think Mark Martin is the best driver not to have won a title[and better than a few that have].I mean 4 ASA titles and 4 IROC titles are pretty #%$@# good.Throw in his BGN win record,his runner-up finishes for the title in WC and the amazing top 5/races ratio and he begins to really shine.
[still have a faded bumper sticker on my old pickup that reads:MARK MARTIN,THE REAL 1990 WINSTON CUP CHAMPION!]