I've played halo 5 and it's no where near a pay to win because everything you buy you have to play untill u get a certain level and if u die then that level is reset so unless you are a pro at the game you will not get to rank 6 every game
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Rank 6 isn't hard to get.. It's the rank 8 stuff that I have issues getting to. My only DMR has a longshot sight and a energy bayonet at Req 8 and I hardly get to use it because I always get it near the end of games.