No post game lobbies, no viewing of peoples profiles, or even seeing their premade emblem unless you invite them to a game, or in-game.
Being able to customize what is searched for.
No team heavies.
I thought to myself that MCC was going to be a template of what Infinite would offer and it’s disappointing to see what was lost, at the very least it sucks that we don’t have playlists for specific modes & that there is no infection, I hope we won’t have to wait months like we did with Halo 5 just to play infection ಥ_ಥ