This is an obscure one, but...
The official worst game I have ever (attempted to) play is a little stinker called
High Fantasy. Now, usually, I can find something of value in games (even if just an interesting piece of art). But this, it had ABSOLUTELY NO redeeming values. The character generation system was literally unusable (and I HAVE made characters in both C&S and Space Opera). The combat system had the worst combination of chart-based and formula-based rules I have ever seen. I don't remember the magic system, if it even had one (maybe I blocked it out with hysterical amnesia). And yes, the art was also bad. Ugh! This has become our group's synonym for "bad game system".
Fortunately for the rest of the world, this game died a quiet death in the '80s after putting out a grand total of ONE supplement.
"Honorable" mention goes to another obscure '80s game called
Fantasy Wargaming. Horrible mechanics, but it had some decent information about feudalism, and it is the only game I have seen which has game statistics for both God (as in, the Christian God) and The Devil. It also had a system for determining what happens to your character's soul after they died! That is, whether they go to Heaven or Hell or spend some time in Purgatory! Those things give it some points for audacity, if nothing else.
A few others that stand out:
Synnibar - Designed by someone with a SERIOUS shotgun fetish, among other things. Scary.
Lords of Creation,
Powers and Perils, and
TimeMaster: All suffered from a common fault: good setting ideas, horrible game systems. Many other games suffer from this, even today. It's sad, really. Even one of my favorite settings (Tekumel) suffered from this for most of its life. I don't know about the current version, as my gaming budget is very limited these days.
As far as
RoleMaster and
Palladium go: They have some major flaws, but are far from the worst games out there. The complexity of Rolemaster is daunting, but it has some great ideas, and is quite playable. I will probably stay away from Palladium, mostly because the game (especially Rifts) seems to attract far too many munchkins for my taste. The game system is playable, if the GM tones down and evens out the power level.
OK, enough rambling. What I really want to know is: Does anyone actually OWN that holy grail of terrible games, the legendary, semi-mythical
Spawn of Fashan?