I agree that I don't think they would give you crap tea either.
I don't know about Chinese tea, the stuff I get is from Japan.
The Japanese stuff you speak of is matcha....a powder whisked up.
I've never had a full cup of that, the rice in the tea I spoke of is coated with it, but doesn't make a difference texure wise in a big 12 oz cup of tea.
The only thing I can think if the tea tasted fetid (and I doubt they did this, or would do it on purpose) is if they made it with boiling hot water, or let it steep too long.
Green tea has to be made with very hot water, not boiling, and should steep no more than 2 minutes.
I know if I've put tea in a cup then got called away for 10 minutes, it wouldn't be at it's best, and would have an off aroma, and a weird, like you said fetid taste.
As you know, green tea is not fermented, so it's very delicate. Can't be treated like black tea.
Today, I don't care for fermented teas anymore, as they Always have that what you might call "old" taste, like it's going off.
Lordyaswas, I remember you once saying long ago that you didn't like tea anyway, but preferred coffee.
Do you like your coffee strong, and how do you take it?
farmer, here's matcha...is this what you got?