who else can only play 50% of halo 4?

so I can only play 5 mp maps (in the rotation, 7 overall) and all but 1 campaign mission - spartan ops is out of the question - and I’m wondering if anyone with a similar problem replaced their copy of halo 4 from where they bought it and had it work 100%. I’m also wondering exactly how many people have this issue, cause in my mind it is the only thing wrong with the game. thanks.