Wonderful post cleared up my confusion about the ranking system.
There is a skill rank system but it is invisible.The only part of the trueskill system that you see is what affects your exp.The better you are=more xp over time.
Sounds like you might have a networking problem.It also sounds like disc 2 might not have been installed properly,or the update might not have been installed properly,which if that is the case you could clear halo 4 cache and try again.
My opinion on spartan ops is that is that it is boring.
Very repetitive.
little to no replay value
way to easy with the unlimited lives(very easy even on legendary).
no scoring system.
not fun and not built to play by yourself.
cutscenes are lame.
doesn't explain things(why are the prometheans still red if the didact is dead,because wasn't it when the didact regained control that they became red.
why do we have to play as some lame sideline character named crimson.
every mission feels like some petty errand.
most missions end with just clearing out the same enemies over and over.
Great game 343 but spartan ops is in my opinion is pretty crappy .