I keep saying it (hoping someone from Bungie will see it)... COLOUR BLIND OPTIONS so we can actually see the radar (can't see red very well).
Audio slider to reduce the music volume - can be hard to hear teammates at times.
Third person option (for the Machinma people... I hate 3rd Person shooters lol). Making our own videos to show how awesome the game can be if you truly dig into it. Even when failing a mission due to bringing the wrong tools is fun... Hell, we got pwned by Goblins at one point and we were laughing at our failures... You get out what you put into the game. Best option would be the recording system like in later Halo games.
A MAP SYSTEM... I didn't think it was important... until I got lost on Mars hehe.
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A good example that the music is too loud is when the Walker Public Event happens in Russia. The drums get so loud you cannot even hear the frickin guns firing.