I have been drinking green tea every day since 1997 and consider myself poverty stricken if I can not source good stuff.
I only like the sweet and tender teas because I use a lot in the cup and always infuse with boiling water.
I am highly discerning about the lack (but not complete absence of bitterness). In my reviews I will use the following system for grades:
Very high = probably too expensive for me to drink every day
High = an excellent tea that I would drink every day
Medium = a good tea that I would drink every day without complaint if I had nothing else
Not for me = self explanatory