Elky wrote:
If its too easy then make someone who's not so easy: Neurotic, Insane, Slob, Unlucky, Couch Potato
That would make it harder...
Some of the "negative" traits can be surprisingly positive, though.
Slob for instance, which doesn't immediately clean up unless you prompt them - but who don't get the negative moodlets for trash and grime and clutter, which would actually be a pretty good bonus if you're just starting your house and trying to juggle skilling, gardening or whatever, a new job, romancing... and don't have time for little things like cleaning.
Neurotic lets Sims briefly "freak out" which gives them a positive moodlet, and I think wipes out stress (I'm not 100% sure on that one).
I haven't played really with the other ones yet, although I know that Unlucky Sims can be revived by the Grim Reaper for his own amusement if they'd have what would normally be a fatal accident. I don't know if that'd balance out other negative affects from it.