This should be somewhere between 25-50 %ile of Christie's books. Not really a bad collection of stories. But then, Christie had set herself a high benchmark and this book does not really succeed in matching the high expectations readers generally have of the writer.
The Greek connotation is interesting though 'Hercule Poirot is nothing like the legendary hero Hercules'. You can go for this if you are done with the other Christie masterpieces.