oooh, I forgot a good one. I really had high hopes for this after reading the books, and the fluff and concepts were great. The game system, however, fell flat on its face. Combat and character creation was a disaster. The game: Living Steel!
It was also a headache for GMs, as the players got to make grand decisions on saving a world, like, we want to grow food for the refugees so they stop eating each other, what resources do we need and where do we get them? And the obliging gm needs to come up with said lists and locations for the players. (The game is set on a post-invasion world where the group needs to save civilization and gather refugees. It is a very well thought out gameworld, but very complex for what the pcs need to do.)