It's an acquired taste. All alternative sweeteners taste differently from sugar. These days, I appreciate that such beverages don't leave a film in my mouth and have a little extra bite compared to sugar.

I think it's interesting that people go through effort to acquire tastes for various formats of alcohol, dark chocolate, black coffee. A taste for aspartame is more useful to acquire than any of those, in my opinion, but alas it's not associated with refinement and sophistication.

It's better to think of flavors as different rather than strictly better or worse.