1. Worst game you ever played
"Played"? Not just owned, or ran? I mean for "owned" I could go with the Whispering Vault. For "ran" I could say. um...Rifts? Played? I haven't played in that many RPG's, truth be told. I'm more a GM. And I've liked most of them. Let's say TORG.
2. Interesting rule embedded within otherwise baleful game
While I'm not the biggest fan of hit location charts, if you want one the clear-plastic-overlay-on-top-of-body-silhouette from Millenium's End is a lot of fun, if just for the suspense of it.
3. Game you never played but you knew it sucked just looking at it
4. Game you most wish didn't suck
Rifts. I'm pretty excited that Savage Worlds got a hold of the license, although it might count as a sign of the apocalypse.
5. Game about which you have the most mixed feelings
6. Old game most in need of an upgrade
7. Game you can run with the least prep
Marvel Heroic Roleplaying
8. Game with awful art (and who you wish you could hire to fix that)
The Ultimate Hero, and Adam Warren
9. Best houserule you've seen in action and now use in your own games.
See the original RPGaDay entry
10. Game you've most changed your thoughts/feelings about
Marvel RPG Saga Edition. When I first ran the game it was the first non-Champions superhero RPG I had used, and its abstract, not-point-buy mechanics seemed alien to me. Now, it seems really ahead of its time.
11. Game you'd use to run just about any setting if you had to
I'm not a huge fan of generic systems. Let's say FATE, which I've only used a couple of times, but seems to be pretty flexible.
12. Game that haunts you and you're not sure why
Being "not sure why" is the part that makes this question hard to answer, because I have a good bit of self-awareness (at least when it comes to this sort of thing) and know why many games haunt me. I mean, the old FASA Star Trek RPG haunts me, but that's because it was the first game I played with adults, and with the first girl who kissed me.
13. Game that would probably be most fun to play a bee in
Over the Edge
14. Best Star Wars game?
West End Games' Second Edition
15. Game that's good in theory but you're kind of on the fence about it to be honest
Most recently that would be the Cypher System rulebook. I've seen some neat things done with it at Cross Planes, and will admit I haven't finished it yet, but I can't shake the notion that it might be the answer to a question I'm not asking.