I guess you weren't here in year 1.
Many complained about Fireborn and how it was an unfair ability in PVP.
Many complained about how flame shield and Radiance provided to much armour.
Many complained about Novabomb being too OP.
Many complained about Blink.
Many complained about how a Sunsinger with Radiance wearing The Ram could survive almost everything in the Crucible.
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Many people complained about the infinite rez glitch