Warsaw Pact armed force had one advantage : they use standard
equipment supplied by former USSR, they were unified by communist
beliefs.
Whereas, NATO used their own weapons and try to maintain unique
identify by disregarding USA sometimes.
However, in the times of war, many of Warsaw Pact soldiers would
defect en-mass to NATO side, or even organised internal mutiny
against "Soviet puppets" (communist party in their own
countries.)
Besides that , Eastern Europe military forces were inferior to that
of Western counterpart. Why ? They don't do scientific research to
ensure that their own equipments are better .
For example, MiG 31 Foxhound is generations behind F-15