GoT being rated highly is probably also due to a couple of other factors. One is the hardcore book fans who also want to watch a well-done screen adaptation of the source material. It's a pretty good adaptation.
The other factor is the willingness of the author to give the middle finger to certain conventions... think the 9th episode of the shows seasons where shocking things happen that wouldn't happen most works of fiction. Main characters getting gibbed.
Imagine if Draper were killed off by his secretary in the first season...
Also, its primo production values. The sets are sumptuous.
As for best scripted shows ever, Homicide: A life on the streets . . . Homicide was on NBC in the 90s
Ah, Homicide! It's a semi-neglected masterpiece. It came out at the exact same time as NYPD Blue, and that show, starring that hunk of mediocrity David Caruso, was all anyone was talking about. No one seemed to notice Homicide, which kicked its ass for gritty authenticity.
Andre Braugher at his finest! What a great cast of down-home dirtballs, especially in it's first couple of years: Richard Belzer, Clark Johnson, Jon Polito, Ned Beatty, Melissa Leo! All presided over by the OG, Yaphet Kotto.
Then they phased out first Jon Polito and and then Ned Beatty and I was one sad panda.
Jon Polito (Det. Steve Crosseti) & Clark Johnson (Det. Meldrick):
"Homicide: Life on the Street: Son of a Gun (#1.3)" (1993)
Det. Meldrick Lewis: What's that?
Det. Steve Crosetti: I... it's a rosary, alright? I'm praying.
Det. Meldrick Lewis: Praying because you didn't break your hand?
Det. Steve Crosetti: I'm praying for Chris.
Det. Meldrick Lewis: Well that's fine praying for Chris, but you didn't even pray for yourself when you got shot.
Det. Steve Crosetti: [punches the car window three times] I think I broke my hand.
"Homicide: Life on the Street: Three Men and Adena (#1.5)" (1993)
Det. Steve Crosetti: You got toilet paper over there?
Det. Meldrick Lewis: No.
Det. Steve Crosetti: You got five $1s for a $5?
"Homicide: Life on the Street: See No Evil (#2.2)" (1994)
Det. Meldrick Lewis: [Crosetti thinks a shooting death is a suicide] There's no note.
Det. Steve Crosetti: Maybe he wasn't the literary type.
"Homicide: Life on the Street: Gone for Goode (#1.1)" (1993)
Det. Steve Crosetti: That's the problem with this job. It's got nothin' to do with life.