Guild wars 2 is now free to play. I suggest you get it and learn what a real MMO looks like. Add me at JDubsH, I would love to run dungeons with anyone who joins. But until you do, don't call Destiny an MMO, its embarrassing. Seriously.
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In MMOs weapons/gear don't change how you play are any mechanics they just make you stronger. There are some exceptions like gear that makes you more mobile/tanky/ect but overall gear is purely stats. In DESTINY weapons and exotic Armour pieces change everything from how you move to how you plan and fight. It's sorta mobaish in destiny how you can swap some weapons or an exotic armor piece and suddenly be a totally different type of badass.