Alot of people dudnt like KF for alot of different reasons. Mostly because if you screwed up on certain fights it was a wipe. Sone of those encounters are the encounter before war priest, sisters and oryx if you died on a platform, oryx if you didnt get your ogre killed quickly enough and or the right spot, nit getti g your knight killed, lag/ogre teleportation (thats not a joke) and just having to sit around.
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So what you're saying is: People dislike it because they are bad at the game. Well, that sums up the modern online gaming culture nicely, doesn't it? :)
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They disliked it because 90% of the player base are casual gamers looking for fun, not an unforgiving mechanic driven headache. It's also a very passive raid much like the Year 2 Crucible Meta.