Yes, Americans don't historically usually drink amaros or bitters. Amaros seem to be gaining in popularity though, perhaps the malort resurgence is part of that trend.
Right, it's a herbal bitter, not citrus like campari. And not an especially sweet one.
I am not good at remembering brand names there are so many. One I enjoy that comes in tiny little bottles and does have a bit of a foothold in the USA is the digestif Underberg.
Sure, that whole category will be seen by some Americans who are not interested in bitter and digestifs as not particularly palatable. But still nothing special about Malort.
Wikipedia says "Malört is an American brand of bäsk liqueur, ", with bäsk being a Swedish wormwood-based thing. Googling for wormwood amaros finds a variety to try, if the wormwood bitters is what you're looking for. The good ones will taste a lot better (and be a lot more expensive) than Malort, because, right, Malort isn't especially great, it's true.
i had Malort for the first time only a few years ago. I was like, wait, this is it? OK, it's a not especially great example of the category, it's kind of mediocre, but I've drank plenty of the category and don't find it especially hard to drink.
But "a mediocre bitter digestif" is obviously not as good marketing as "the worst drink on the planet, drink it as a challenge and impress your friends".