I actually owned the game way back when. It's bad, but also so over-the-top bad that it might make for a fun read. It's not like FATAL or SF:NG where it's bad and filled with bigotry or other nasty things. At least not from what I recall--I owned it probably 25-30 years ago and I doubt I read the book more than once.
It's basically built entirely for powergamers and includes a rule that the GM not only is supposed to stick to the adventure completely, but the players can demand to look at the adventure to make sure that they did. So it has a GM vs. Player mentality, but on the side of the player; the GM is just supposed to provide things to kill. The basic setting itself isn't terrible--a god or gods, seeing that some disaster would destroy the Earth, hollowed out Mars and turned it into a World Ship, filled it with people and magic and weird science, then sent it off into the cosmos. A competent GM could do something with that idea. It's just that neither the lore and rules make any sense and McCracken started off by insulting other RPGs (because his was so much better) but fell into the exact same traps he claimed made those other games bad.