This is an odd question, but which carnivorous plants do you actually dislike (whether it's their difficulty with growing, their appearance, etc)
Personally, I'm not a big fan of the Venus Fly Trap "Dente" because it just looks bad. It goes against what a Venus Fly Trap should look like (the "teeth" are a signature feature that everyone recognizes) and it looks cheap, as if someone took some scissors and clipped off the teeth.
I also dislike Drosophyllum with the fact that Drosophyllum can only be reproduced from seed, it's near impossible to transplant them without killing them, and if they are over-watered, they rot away.
What about you?