I just don't think a killing floor game should have crafting mechanics you have to grind resources for.
Nor should it have limited self heals and a downed mechanic.
It definitely shouldn't take away mechanics that were part of the past two games like welding doors.
Or have limited slots for weapons instead of the weight system.
While I also don't like the art direction of KF3, I could have got past that if the game still played like a Killing Floor game. Unfortunately, everything mechanically about KF3 just screams "this isn't Killing Floor" to me.