Never played, but run many times. Considering the investment required to create characters, and the poor attention span/play ethic of most players, I will probably not run it again, but I would be open to playing it.
Played only once, and it was... okay? I could try it again, I suppose.
Basic Fantasy RPG (any edition)
Run many times, and played a few times. I would be open to doing either again.
Call of Cthulhu (any non-d20 edition)
Played only a few times, but depending on the game style I would be open to playing again.
Played only once, no interest in playing again.
Played a few times; probably wouldn't play again without an excellent campaign or referee.
Dungeons & Dragons (Holmes, Basic/Expert)
Run B/X many times, but never played. I would be open to doing both again.
Dungeons & Dragons (3.5)
Played once. Not interested in playing it again.
Dungeons & Dragons (5th Edition)
Played many times, with mixed results; I could play it again if the referee is competent and there are no other options available. Never run, nor do I want to.
Ran once, never played. Would be open to playing or running again.
Ran several times, never played. Would be open to doing either, depending on the group.
Played only once; system-wise, I might as well just play D&D or Savage Worlds.
Mage: The Awakening
Played only once, probably won't play again. I'd be more inclined to try the original version.
Played several times. Depending on the referee, I'd definitely be open to playing again, but not running.
Ran the Beginner Box many times; have played that as well as the full game several times. Would probably not play the full game again, nor run either one.
Pokémon Tabletop United
Played several times; do not want to play again.
Played once; no interest in playing again.
Played several times. Depending on the campaign setting, I'd be open to playing it again.
Star Wars (D6, first edition)
Ran several times, but never played. Would be interested in doing either in the future.
Star Wars (d20, Saga Edition)
Played several times. I could play it again, but why not just use the D6 version?
Stars Without Number
Played only once; I'd be interested in giving it another shot.
Vampire: The Masquerade (Introductory Kit)
Ran several times, with good results. Would be interested in either playing or running again.
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Advanced Dungeons & Dragons
Never run or played. I would be open to playing it.
Doctor Who: Adventures in Time and Space (Limited Edition)
Never run or played, but would be interested in doing either.
Dungeon Crawl Classics
Never run or played. Would be open to playing, but running is less likely without a group of seriously committed players. (Side note: the critical hit tables actually make me uncomfortable in their detail, so I would most likely change or remove them.)
Dungeons & Dragons (original)
Never run or played, but would like to try both.
Dungeons & Dragons (Rules Cyclopedia)
Never run or played, but would like to try both (especially considering its close similarities to B/X).
Ghost Dog: The Way of the Samurai
Never run or played, but would be interested in either. Assuming I can come up with modern-day scenarios, that is...
HackMaster (4th Edition)
Never run or played. The latter is something I'd love to do; the former is not.
Never run or played, but really want to.
Never run or played. I'd be interested in the latter; for the former, I'd probably just run it using Savage Worlds.
Never run or played; as above, I'd keep the setting and jettison the rules in favor of something more comprehensible (like The Pool).
The World of Darkness (nWoD)
Never run or played, but would be interested in playing.