As a tea drinker and the creator of RateTea, I am a major advocate for buying and drinking loose tea.
I feel confident that once you switch to drinking loose-leaf tea, you will never go back to tea bags, with the possible exception of using them now and then for convenience when you're traveling, at an event, or somewhere where it's impractical to brew loose-leaf tea. Loose tea offers superior flavor, better value for price, and opens up a world of possibilities for the tea drinker. It is also more sustainable--better for the environment!
Why loose tea? The main reason is that when you buy tea bags, you are paying primarily for an industrial packaging process; when you buy loose tea, you're paying for the quality of the tea leaf itself. Which would you rather be paying for?