It's good in moderation... However if you become addicted to it, then it becomes bad.
I drink one once a week, its tolerable, but I cant understand people who drink many times a day.
Then it becomes unhealthy.
I do actually drink it twice a day: one 1/2 litre of Coke and a 1/4 Litre of coka cola.
I don't think that that is too unhealthy. I drink the 1/4 Litre with my lunch and the 1/2 litre of coke in the evening, usually eating at this time too!
I think its bad for the teeth and too much sugar can make people dizzy.