There was this gun called Vex Mythoclast and Suros Regime* No matter what gun you had (maybe shot gun and sniper if you can pull off the shot) and you were going against these beast from hell.. You never forget the horrid memories of someone going 25-0 in under 5 minutes
EDIT. (Totally forgot about final round sniper's)
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Those weren't shit compared to final round snipers...