Good Coke zero was utter trash and tasted nothing like Coke.
If you're going to drink soda you might as well drink the original. Coke zero/diet tastes like crap. All diet sodas do.
This mindset I've never really understood. I don't drink Diet Coke to approximate the taste of Coke. I drink Diet Coke because I like it completely apart from Coke. It taste nothing like Coke, and I don't want it to.