What did you expect them to do? A new developer on a major franchise, I'd play it safe for the first game out the door too.
Do you have any good ideas on how they could change it up for the next game?
Not that I could give them new gameplay ideas, but I could give them suggestions. Such as taking risks with the gameplay formula, adding new elements to the original core Halo gameplay to freshen it up a bit, and just take it into a new direction.