many games actually require GFWL to even save. This is a huge issue.
Heck a lot of them require you to log in, even to play single player. For Fallout 3 you had to login in order to play the dlc's.
The whole system is bullstuff, since it either forces you to log in order to play single player, or to save a game. Having rooted so deep will basically render tons of games unplayable or lost. This is one reason why cloud gaming is a bad thing and that we need physical copies of our games. If Valve were to go out of business steam would die with it and then there goes all of your games. *poof*, just like that.
The nice thing about steam though is that I don't have to worry about damaging discs or loosing a cd/key.