^ I've had the Sencha green tea. It's not incredibly sweet, but a very small bit of honey adds a nice flavor. It's not bitter. If you're looking for a sweeter or mild flavor, you might want to try a white tea or green tea blended with fruit, like orange blossoms or acai berry. I've had variations like that, and I found they didn't need any sweetener.
When I first had green tea, I thought it was a little earthy tasting and needed a lot of sweetener, but I gradually cut back, and I enjoy most types of green and white without sweetener now. You get used to the taste.