I finished the first 5 chapters or episodes or whatever they are called. My problem now is I will probably never play those again, I wish they would have left firefight in the game or something with a replayabilty factor. I understand that there are more Spartan Ops coming, and I will play those, but probably only once. I just can't see myself finding a reason to replay them, I may bump them down to normal and try to find Easter Eggs, and Achievement hunt, but that's it really.
Just a thought, and has probably been brought up already. Oh well.