Halo 4 was a dissapointment

I completed the campaign on easy alone in an hour or two then played it with a friend on legendary which took 3-4 hours, super short campaign and the story line was mediocre. Multiplayer was okay, but the ranks didn’t last long enough and now I’m at 69/70 possible ranks with not much of an incentive left to play ( I seriously don’t understand limiting the specialisations at release, and then only giving it to some counties). I only played 1-2 hours a day since release and I’m quite disappointed with the lack of content in this game. I’m sure loads more people will be in the same situation I’m in and interest for multiplayer will die pretty quickly.