Reactive power in a system
The statement "reactive power is not good" is not always applicable. Yes reactive power does not contribute to any energy transfer but contributes to losses. However there are situations (notably fault recovery in a large power system) where reactive power is highly desirable.

EDIT: adding some info based on comments:
Induction machines- motors and generators-  need reactive power to function: in crude terms this reactive power sets up the "magnetic field" in the machine. Transformers draw reactive power too.