From what I've seen, the core gunplay of Destiny isn't particularly unique. It honestly looks like the same generic ADS filled borefest that CoD, Battlefield and countless other modern shooters use.
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There's a lot we haven't seen yet. Not sure how many different ways people can make a FPS with guns different from each other in the manner you describe. 1. Pull Trigger, Let Go, Repeat 2. Hold Trigger, Let Go, Repeat I'm sure Bungie will surprise us, so please hold judgement until we see more.