Funny, I just posted in the Maintainer's forum about tea.
I drink a little black/green tea and a LOT of herbal tea, and only plain.
It tastes really good to me now, but that MIGHT be because I quit sugary drinks cold turkey and started drinking only water in April. I know that before I thought unsweetened tea tasted like water and only found it palatable with spoonfuls of sugar in it. But now I can appreciate how good it tastes all on its own!
So maybe just think of it like drinking water with a kick to it... you don't really *need* the sugar, and it just adds calories. In fact, I just drank a cup of Celestial's True Blueberry herbal tea, and well, maybe it's just my imagination, but I thought it tasted sweet even though it was unsweetened!