Within any tea type/variety, there is a wide range of quality available to consumers living in China. The western tea consumers are increasing noticing the quality differences.
The quality differences of teas are similar to that of wine in the western culture - while there is a range of different wines, there is also significant quality difference within each variety.
Generally speaking, the freshness of a tea is correlated with its quality, among many other factors (Pu-erh tea and certain aged white teas are exceptions).
This section discusses how to distinguish quality differences in various teas.