I thought the first two seasons were brilliant. I swear you could feel the life being sucked out when they cut Denny's lvad. Still, season three had some great moments. Season four I excuse because there was a writers strike in the middle. Season five I thought picked up because despite the Denny's ghost story I liked the Owen PTSD storyline. It's been a steep decline since then. I don't see how it can last another season past this one, but maybe it will.