The Alpha showed me, that I have no change against all the FPS 24/7 players in PvP.
Do you think the game is playable without doing any PvP? Some weapons in the Tower where only buyable with a specific PvP rank. Are there equal powerfull weapons withou PvP. Do you level in singleplayer/COOP at the same speed as with PvP?
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PVP is SUPER unnecessary if you don't want, and you can get PVP ("Crucible") gear by earning Crucible points other ways, such as selling spinmetal to the Crucible Handler in The Tower, thereby allowing you to get that you want without the PVP-ing.