During the XBL DDoS outage a few weeks ago, I temporarily lost all progress in Flatout UC because it uses GFWL.I never understood the GFWL hate. I played through arkham asylum and arkham city on PC with no problems. GFWL always worked fine for me. If it had steamworks cloud saves it would have been great
Beyond the overtly irritating things like that, there's just no interest in the service from either Microsoft themselves or people who game primarily on PC. How many fan/community sites do you see devoted to GFWL, versus Steamworks fan sites for things like achievements?