the trick to making green tea taste great - don't use boiling water!!
When you pour boiling water straight on green or white tea, it scalds it and releases the bitter tannins that make it taste bad - properly prepared green tea has a lovely subtle refreshing flavour. You need to use water that's around 80 degrees celsius. I usually just put a little bit of cold water in my mug, then fill it up with boiling water from the kettle, then put the teabag in last. Same applies for a pot of loose leaf tea.
And as far as health benefits go, there's certainly a lot of literature and scientific research around that confirm these benefits - and just look at the longevity of cultures that have traditionally drunk it every day! There's something in that too.
hope that gets you all sipping lovely non-bitter green tea!