You see the defenition if something is playable or not is quite subjective.
Well, in most cases I don't believe people can be objective. By that, I do not mean that my points are not valid... rather, they reflect MY views on the specific matter in question.
But... 8-12 FPS is not much. I can understand why people, if they have no other option, decide to play through Quake on their 68k Amigas. But, the framerate IS low, and a 68k Amiga CAN'T do the game justice (or rather, the versions that exist today for the 68k Amiga don't do the game justice). That is not me being subjective, that is a fact. Of course, then it is up to the people playing the game to decide if they find it playable or not. But no one can claim it to be playing WELL, because it isn't. 10 FPS was not what Quake was designed to run in.
So, yes, I might be subjective on the "playable" matter, but if someone considers the game is done justice on a 68k Amiga, please step up and explain why that is (for any other reason than the one that it is Quake on the Amiga and that it is great that it can be, and has been, done).