Here's the thing good players don't care about what weapons they use,they will still get kills. They adapt to the game.
As a ex-Halo player the pulse rifles aka battle rifles or scout rifles aka DMRs rule in Halo PvP. It separates the good players from the normal.
Have any of you saw the video where the guy solos Crotas End with No Land Beyond. Strategy is more important than guns.
Plus I'll use any damn gun I want when I play. I'll run shit solo before someone dictates what I use