The abundance of various animation cancels in Gunz made the game almost infinitely replayable, but also created an immense skill gap that made the game almost unplayable for a newbie. The companies that published this game in the past tried to suck as much money out of it as possible, which meant cash shop items were overpowered and if you didn't spend money your chances of winning were significantly lower. People left the game in droves, feeling donators have an unfair advantage, and new players would never stick around because of the crazy skill gap.
This game seriously needs a revival.