After Season 2 - Watchable But Not Believable I'm giving Dark Winds a 5 because I watched both seasons to the end, which probably says more about me than the series itself. (I'm retired and don't have much to do in the evenings.) I enjoyed the awesome Western scenery; the plot and characters were interesting enough to keep me watching, and the Navaho culture presented was also interesting (I wouldn't know if it was authentic). The best character is Julie Matten, looking fierce as feisty Navaho police office Sgt. Manuelito.
The worst aspect of the series is that, when you take away the scenery and setting, it's just another violent TV cop show. The characters do not behave like real police officers (a legal or police procedure adviser was desperately needed). The first example was early in Episode 1, when Jim Chee announces that he has been assigned to Lt. Leaphorn's Navaho Police precinct. Wise old cop Leaphorn says he knew nothing of the assignment, but lets Chee go right to work instead of calling his commander for verification. The series is based on Tony Hillerman's classic novels, which I read many years ago. However, in episode one, I noticed that Chee, one of Hillerman's core characters, had been fundamentally changed, from a humble Navaho cop to an FBI agent trying to deceive the Navahos. Again, unrealistic. (These are only spoilers for the first half hour of season one.) Then in season two, an experienced officer makes a major mistake that moves the plot along but would never be made in the real world.
Another major flaw was that there were too many characters and too many subplots that were unresolved or seemed irrelevant. If you haven't seen the series and you have nothing better to do, enjoy the scenery, suspend all your disbelief, try to follow the main storyline, and cheer for the good guys to catch the bad guys.