I finally finished the last two seasons of "Boardwalk Empire" on HBO. While the quality did somewhat fall off towards the end, I don't think it's as bad as many say. It's funny, I remember this series being a big deal while it was airing, especially in the early seasons, but it just kind of came and went and I feel no one really talks about it anymore.
Overall, I think it's a really fun series with outstanding writing and character development. I'd highly recommend it, but I don't think it cracks my Top 5...
1. LOST
2. Breaking Bad
3. Better Call Saul
4. The Sopranos
5. Six Feet Under
6. Dexter
7. Boardwalk Empire
8. Ozark (great first three seasons but holy crap season 4 was a flaming dumpster fire)
"Deadwood" and "The Wire" are still on my list, trying to decide which to watch next.
I'll echo others saying the Wire. To be fair, I've only watched 3 of your top 8 (Breaking Bad, Better Call Saul, Ozark), and agree with the ordering for those 3, but I think the Wire is so far ahead of all of them. I've watched through the Wire 2-3 times, and spent countless hours re-watching scenes and character super cuts on YouTube since.
Some tips:
The Wire doesn't spoon feed you anything and is much lighter on exposition than most shows. You'll be hit with a lot of realistic cop and street slang that they don't explain. They just throw you in their environment.
It moves at a snails pace. Most shows resolve an issue every episode while introducing a new issue (to be solved next episode), while also building towards whatever the overall arc of the season is, while the Wire just really builds to the overall season arc. And I don't think any episodes end in a cliffhanger (or if thy do it's rare).
So that being said, you really have to pay attention. It's not a whodunit where you have to pick up clues, but there's a lot of dialogue and subtleness that explains character motivations, lays the foundation for future actions, etc. If you watch it like I watch most TV shows (scrolling on your phone, having a conversation with your spouse in the next room or on the couch next to you, not pausing when you go to the kitchen/bathroom, etc. because you don't think a scene is important), you'll miss a lot of stuff and will probably be one of those people who don't understand why the show is so highly regarded.
Personally, I think it takes like 3 episodes to really get good and start to understand it.