As an ex-maintainer of globulation2 I strongly agree. FOSS gaming is in a desolate state. On a standard distro you find bzflag, tuxRacer, abuse, zaz, mahjongg and maybe nexuiz and cube and some titles like Spring require you to legally own old closed source games to play all the content ... hmm ... but Spring appears to still be active. I'm curious now to try it out. I think it used to be playable only with an original Total Annihilation license. Now there appear to also be completely open mods.