What about both versions of 21? The 50's version may have been famous for Stempel vs. Van Doren, but the 2000 version was much better, and lasted longer than its predecessor. They both started out well, but the 2000 version lasted longer. MUCH Longer.
A few things why:
1. Multiple choice questions
2. Bigger payouts
3. Perfect 21 Bonus Round
In addition, I'll add my favorite, Winning Lines. It did VERY well on Night #1, with Catherine Rahm's $500,000 Wonderwall win. But the home-viewer sweepstakes didn't attract viewers, and the show just jumped the shark, when it SHOULDN'T have.