A parliamentary system is one in which the executive and legislative branches are one (EG if the president was a member of congress, and chosen by congress).
As to the implication that proportional systems don't result in individuals representing constituencies or geographic regions, there are numerous hybrid systems that manage to achieve the best of both worlds http://en.wikipedia.org/wiki/Single_transferable_vote
@lmkg seems to be referring to a proportional electoral system, not parliamentary http://en.wikipedia.org/wiki/Proportional_representation
As to the implication that proportional systems don't result in individuals representing constituencies or geographic regions, there are numerous hybrid systems that manage to achieve the best of both worlds http://en.wikipedia.org/wiki/Single_transferable_vote