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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Give me three examples of shooters where the gun play mechanics aren't generic that have been made after 2005. Bonus points if at least one of them is popular and not Halo. The reality of it is, it's incredibly difficult to make unique gun play mechanics because there aren't many directions to go to. It's the rest of the game that will decide how unique it is.