I think nobody really touches David Simon in TV. He's like Miyazaki in anime I feel. First it's him, then everybody else. The Wire, Treme, Generation Kill... it's just another level. On the next step below we'd have things like Man Men, Deadwood, The Sopranos, etc.
I think the Wire excelled at a more difficult game because the writing adhered to a kind of journalistic dogma that didn't allow for many of the tricks used in the storytelling of Breaking Bad or The Sopranos. Walt could blow up a room and not only survive, but convince a psychopathic drug dealer to do business with him by that very act. Tony Soprano could garner empathy and understanding by showing us his dream sequences. But The Wire gave its audience only what its characters said and did. Characters who-- by and large-- couldn't just "problem solve" their way out of their circumstances like Walt did so often.
Season 5 is the most underappreciated season, but I've really started to appreciate it.
McNulty has been a character who believes the ends justify the means. In Season 1, he falsifies that Sidner (iirc) was on the roof, thus allowing the police to admit phone tapped evidence.
In Season 5, it shows how taking that mentality of by any means necessary can quickly spiral out of control.
I enjoyed deadwood, and I thought the story arc with The Comstock and George Hearst as a robber baron was going to have a huge payoff, but instead the series was cut short which is a huge shame.
There is just enough foolery to make it easily tier 2 for me: Francis Wolcott's story arc, Olyphant's acting, Seth Bullock's attempt at morale highground.
If folks aren't turned off by violence, profanity, and prostitution, it's definitely must watch tv.
Sopranos is in the tier JUST immediately below The Wire and Breaking Bad, for me. Amazing TV, but not quite at that extra-elite level. I have not yet watched Deadwood, and judging from these discussions, I should.