Let's kick off a great big thread of your favorite and least favorite games for each, every, or any system you've had some experience with. You should have played a significant number of games on the console to make these calls!

I'll start it off with a few of my favorite systems and add more later.

Intellivision - Best: AD&D Cloudy Mountain. Worst: Star Wars Empire Strikes Back
Genesis - Best: Streets of Rage 2. Worst: Earth Defense.
3DO - Best: Road Rash. Worst: Shadow War of Succession.
PlayStation - Best: Final Fantasy Tactics. Worst: Intellivision Classics