@simsplayer818 , I've never had either Vegemite or Marmite, but I did take a pottery class at a local college years ago, and someone who had a family member who lived in Australia brought some in for us to try. I refrained from trying, but I did smell it, and I wasn't pleased. 😅 But this was many years ago, before I knew about the umami taste, and how umami is a taste with receptors on our tongues just like salty, sour, sweet, and bitter! I've heard an Australian say it is much like a thick soy sauce in taste, and since I do like soy sauce, I probably would be ok with Vegemite or Marmite. But I am a picky eater.
I can see how as a kid you wouldn't be too enthused with Marmite, at least by the looks! But most people when they get older start preferring saltier tastes over sweet ones at least a little bit. Even older people I know who have a big sweet tooth, have said that they like saltier foods a bit more than they did when they were younger.
If the Sims 4 were ever to get an Australian pack, there would have to be Vegemite.! 🙌