negative Traits in game play

Yes I do all the time. Otherwise sims would be super boring.

Have you tried making an unflirty, jealous sim with commitment issues? Try it xD

He's going to want a soulmate due to the jealous trait even though he has commitment issues, but because he's unflirty he's gonna have a hard time getting anything.

I usually roll traits and aspirations randomly so I end up with some negative traits and weird combinations. Some traits I usually re-roll, like mean, which just frustrates me (although I've left it on a couple). I find squeamish both frustrating and hilarious - I had a squeamish vampire sim with the guilty drinker trait - he'd feel guilty if he drank from another sim but get nauseous when I tried to make him go fishing or catch frogs for plasma packs. Yesterday I aged up a child sim who had the lazy trait and he got unflirty with the soulmate aspiration...that's going to be interesting. :P

I don't use most of the negative lot traits, they're amusing about one time. One major exception is I have one lot that I've played forever with the earthquake trait; I think I leave it on just because it's always been there.

It depends on what I want from a save file, I guess. My latest, I'm doing a sort of Big Brother house-type challenge, so I deliberately set up all 8 Sims with pairs of opposite traits, one positive and one negative per. (With music lover as the third on all of them, because it's the only thing they have in common). It sparked some fun spontaneous drama, having opposite traits running around the same household and ticking each other off. But I turned off lot traits, positive and negative, because I'm doing a lot of screenshots and hate having the auras show up in them, and I haven't found any way to turn those off yet.

It all depends on what you want out of your game to be honest. I've played with a neat, outgoing and romantic sim. Paired him with a materialistic, slob and loner. Shinya would just happily go about cleaning up after Channel. They lived in a tiny little house with all of the cheapest furniture. I used a mod that would allow teen jobs to available for the older stages and had him work as maintenance man. I think he only worked on the weekends. During the week he would tend to his garden and making his herbal remedies to sell. He was saving up to start his own remedy store. Channel wasn't happy as she was always tense from being a loner and being poor. It caused a riff in their relationship. He caught her cheating with Johnny Zest. They broke up and he then fell madly for Bella and she just destroyed him. He;s been a bed hopping bar fly who developed a serious juice and bubble addiction.

I love to add balance to my sims, it really gets boring having them happy all the time. I personally love challenges, and when my sims is in a bad mood, it really adds that aspect of the game.

Like above, negative traits are good to add some balance, but tbh they don't affect much at all when something as simple as an environment buff will make them happy again. Kinda annoying.

Negative traits, they can be quite entertaining. I used them once in a while in the past, but currently I am playing a whole household and it is pretty funny.
I am working on an ISBI challenge where every sim has to have a "negative" trait (by the rules I made up). The sim I control is hot-headed and the rest of the household members are either insane, lazy or slobs. And even though we started out with only one bed and one shower for 5 sims, and I am only controlling one sim, it's going pretty well. I mean, there is passing out, poor personal hygiene, almost dying from doing laundry - which, they do autonomously, but why bother with the lint tray - getting dazed, being confused and talking to appliances and the occasional kicking the trash bucket out of anger and of course there is an illness going around ... but otherwise it's been a breeze!

@PninaSimmer It was originally at MTS but creator is no longer updating or supporting their mod from what I gather. There is an updated one though. Teen careers for all

The negative lot traits "Gremlins" and "Cursed" definitely affect gameplay. The Gremlins one will break things at night while your sims are sleeping....I've had every single thing in the house that could break, all break at the same time in the middle of the night. Cursed will give random angry moodlets because of the bad "voodoo" on the lot...and also seems to up the chances of oven/grill fires with lower skilled cooks.

Lately I have been giving all my sims a negative trait or two. Klepto is my favorite, but I also like mean, evil, lazy, and slob. I gave my latest sim the glutton trait so he can forage food out of garbage cans. I especially love cheating parenthood traits onto sims. Negative traits seem to give sims more personality.