yes and no
FOSS games are good and fun, but to deliver a AAA game with a near-realistic 3D Graphics and a good several hour-lasting story, you kinda need some funding. I would be all for a concept where a game is open source, but you need to pay for the textures, meshes, voiceovers, in game dialog strings and similar stuff that is not code.
the proprietary drivers work pretty great on X11 for me