Agreed, in moderation it's probably mostly harmless... but still, it's a disgusting sludge when you look at it objectively: a syrupy dark thing with excess sweetener/sugar.

However, it triggers some addiction mechanism in my brain, and I must drink it every day. No moderation for me -- it really is an addiction. I don't go to McDonald's: I drink it at home. Diet Coke, so no excess sugar, but I'm pretty sure Diet Coke is unhealthy as well, and I'm not sure those sweeteners are good for you anyway.