The key point of the series is the character's story and the cast. While the story of the series lies under one villain,[Reaper] it was sewn for substories. The underlying motif of the series "as crime" remained alarming throughout. The dialogue/lines from script requires patience for it's viewers. The scene is one-sided so the story is definitely dependent to the episode development.  Sometimes, the investigation could be dreary but the process of profiling, catching the criminal was entertaining. I personally quite pick up some informative terms.
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The series has it's depth and execution, the character-story is stronger than of it's other features. It surely failed on small connecting dots but , as whole, I think it hold more substance than any investigating teams out there in a series.