Every other artificial sweetener tastes
I suspect what you're tasting isn't 'artficiality'. For example, if you taste glucose, sucrose, and stevia, they taste remarkably different, even though they are natural sweeteners. On the other hand, if you compare items sweetened with Aspartame and those sweetened with stevia, you'll find that they taste similar. It seems that the 'very sweet' sweeteners have that kind of cloying sweetness that you can taste all down your throat and that leaves an unpleasant aftertaste, even when they are diluted so the sweetness is equivalent to that of sucrose.
There's a whole science and a lot of experimentation behind sweetness profiles in things like soft drinks. Whatever Coca-Cola did with Coke Zero makes it enjoyable for me to drink, although I can still immediately tell that it's not sweetened with regular sugar. But I still can't drink Diet Coke - the taste makes me wince, and the aftertaste is worse.