You can add as many features as you want as long as they are balanced, and can fit with what Halo already does best, which I think this game could do. The only thing that makes adding features bad is if they don't fit the system (which is still undertermined. A lot of people say some features shown do not fit the system.), or are not executed properly. We will find out in due time about which direction these changes have swirled the game to.