Being a clinician myself, I find the medical aspect of the drama quite realistic. Each episode deals with different social issues, along with the ongoing storyline. And, with Dr. Bashir going through his own PTSD while practicing emergency medicine, is another huge plot of its own rights. Would never get bored waiting for the next seasons to come, and hoping the series lasts a very long time.
I think this is the only popular TV series that have put a immigrant doctor as the main protagonist. Thanks to the creator Joseph Kay for the tremendous initiative.