I just finished Deadwood for the first time and I cannot BELIEVE I never watched this. It's the most beautiful writing I've ever heard in a show. It's like Shakespeare with swearing. Perfect. It hurts. The cast is perfect. The editing and production is perfect. It's just lovely.
I'm really sad it ended rather suddenly, but it the end of the third season actually wound up being a good end. Plenty of loose ends, but no cliff-hanger. I was surprised. I'm also surprised Ian McShane hasn't become a HUGE star. He was just amazing in this role.
If you've got HBOGo and you never watched Deadwood and you like amazing television, do yourself a freakin' favor and WATCH IT.