I gave up that regular Coke years ago for Diet Coke, after a particularly bad tasting case of cans. I actually kind of like the aspartame flavor. Then I gave that up for gold Coke (caffeine-free diet), which is pretty good to have every now and then, without the headaches three days later to punish me for not drinking it for too long.
I still don't get what it is with Coke Zero, though. I had a chance to try some recently, and it tasted pretty bad.