Yes, unfortunately it is just as bad as soda. I don't understand how they can market some of these products to appear somewhat healthy. It all comes down to reading the labels.
I was a big Coca-Cola drinker for a long time. I've just recently discovered Coke Zero and Coke Zero Cherry (which tastes mucho better!) I have also started buying those little flavor packets that you can add to your bottles of water. I don't use those frequently though, usually when I want something different.
Do you like iced tea at all? I like to save my plastic water bottles, fill them with fresh brewed iced tea, then freeze. I pack them in my lunches (helps keep things cool) and it's something different to drink.