Which traits are so disappointing that it's not worth using them?

Hot-Headed, it barely takes over the emotions of the sim (I am usually drowning in positive emotions), and if modded to be a bit more over taking they—just keep dying from cardiac arrest. If the moodlets were stronger, and Hot-Headed Sim's were immune to cardiac arrest I'd use this trait again. As it is fun to have a Sim just overreact, and get mad over little things :P Seeing/having their angry interactions can be very amusing.