i was just gonna mention that
the reason m$ doesnt allow guests in ranked matches is because you can see the other persons screen. this gives u an unfair advantage ESPECIALLY if your not on the same team
either way, all m$ needs to do is split live into 2 sections, ranked and unranked
but im sure the 360 will do it automatically, if a second person is playing itll go unranked automatically, if just 1 is playing itll auto to ranked
only thing is, the more options u give people, the smaller the sections of the games get... id hate to join a section to find NO ONE else is playing it too, cause theyre all off playuing soemthign else