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What is making Killer not Fun?
When I play Killer, I generally have fun. I play a range of killers, Plague, Sadako, Freddy, Twins, Trapper, Hag. When I play, I play really lax and will intentionally let survivors go if they are not good at the game. When that happens, I usually try and 2 hook each survivor, then just chase them down and hook them.
If the survivors are good or better than me, I'll try and get kills. I don't resort to face camping or tunneling-off-hook-till-dead, for me personally, I don't feel that is a win at that point. (Although I did do a test where I face-camped exclusively with Leatherface for 40 games to test to see if it's a valid strategy).
For me, what makes killer unfun is definitely face-camping, I had absolutely no fun doing that until the survivors became so good that I was averaging about 2 kills per game which happened about after 30 straight games face camping, before I got around a 3.2 average kill rate.
Aside from face-camping making the game boring for me, I also found that I really hating playing killer when the teams I went against were so much better than me that I couldn't do anything against them. Flashlight saves, perfect looping, it's a pain in the a*s and is stressful.
Those games don't happen often though. Usually I'm paired with survivors pretty close to my level or lower than my level.
When I face-camp.
When I face teams much-much better than me.