An issue that should be addressed whenever possible is that Halo 4 in the MCC is the Halo 4 launch version (BR is 5sk, Boltshot has a larger range, Turrets are underpowered, ect). It should be updated to the most recent version of Halo 4.
Yeah, I did THIS LITTLE TEST after getting a bit suspicious.
I hope they fix it soon, because the most recent version on Halo 4 is pretty awesome.