The Good: The PDQ (Prose Descriptive Qualities) is easily incorporated into other systems. Characters are rated by Qualities, but these Qualities also have "penumbras" where they -vaguely- apply. Also, Qualities are divided into -five- stat blocks: Mental, Physical, Social, Professional, and Other. The overall system is applicable to many situations due to its non-specific nature. For example, range is divided into "Near," "Middling," "Far," and "Too Far." Damage serves to reduce Qualities, as chosen by -the player-.
The Bad: Players who like their games crunchy, or with setting-specific rules, will probably hate this. Although Qualities are easily adaptable to a given setting, they do not "scale." Period. You can't match Superman against Robin, for example.