If your used to standard coke, then diet coke will probably taste horrible, but if you haven't tainted yourself with sugary drinks, then diet coke is pretty good.
I only drink diet soda, and you get used to it pretty quickly when you have to. I find it funny when people just don't understand it, as if anyone drinking diet soda should be on a diet. 1 in 30 people on this planet are diabetic, and that number is rising - might even say that all the sugar in standard soda is not helping that statistic. People are too quick to throw sugar and chemicals down their throat.
Unfortunately, there isn't a great deal of choice of diet and sugar free soda in Scotland, it's either diet coke, or diet Irn Bru. I'd love to see diet ginger beer, root beer etc, dandelion and burdock. Diet Dr.Pepper tastes like medical waste. I'd have to say my favorite soft drink is Ginger Beer, but maybe just because I rarely get to drink it.

Health, Ammo, and bacon and eggs!
