I think that Destiny could use an option to turn off the damage numbers and "immune" signs popping up when you shoot someone. I see those as kind of pulling you from the universe a bit. I want to be in the boots of my guardian, and I don't think numbers pop out of someone's head when you shoot them in the future. It also isn't entirely necessary as the healthbar is already there, telling you your progress.
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Eh, the numbers help with the stat builds on your weapons and gear. I like options. But I'd keep the number on myself so I could constantly run tests on hit locations and proc damages and the such.