God Tier: Swamp Thing, Watchmen, V For Vendetta, Miracleman, For The Man Who Has Everything, Joker: The Killing Joke
Good Tier: LOEG (volumes one and two), Captain Britain, Wildcats, Whatever Happened to the Man of Tomorrow, Moore's Clayface story from Batman Annual #11
Blah Tier: 1963, Supreme, Ballad of Halo Jones, Wildcats, Youngblood: Judgement Day, Moore's Spawn work
Avoid Like the Plague: LOEG after volume two, Promethea, Tom Strong, other ABC Comics books
My list, this was fun
God Tier: Swamp Thing, For The Man Who Has Everything, Whatever Happened to the Man of Tomorrow, Night Olympics, GL short stories,
Good Tier: V For Vendetta, Miracleman, Watchmen, Captain Britain, Wildcats, Moore's Clayface story from Batman Annual #11, Batman: The Killing Joke, Bojay, DR and Quinch, Spawn work, Awesome work,
Blah Tier: 1963, Ballad of Halo Jones, Tom Strong, Tomorrow Stories,
Avoid Like the Plague: LOEG entirely, Promethea, Tom Strong, ABC Comics books in general; Big numbers, From Hell (controversial take), Lost girls, Yuggoth
Byrne's Superman run was... weird. He tried combining Golden & Silver Age plots with modern story telling. So, you'd get really good world building, use of the supporting cast, subplots, and the build up of various background story threads... but then an issue's A plot would be Superman fighting a chimp or some shit. He lays great groundwork for Post-Crisis Superman, which Dan Jurgens, Roger Stern, Jerry Ordway, and the others then run with after Byrne leaves, giving us roughly a decade of the best Superman era.
Byrne's run has the Byrne fallacies. Fanboy Kirby obsession (Fourth World characters), ego issues with Marvel Wolfman, and his taking things to an opposite extreme of pre crisis super.
But it's hard unless you grew up with pre Byrne Supes how much he fixed the characters problems (albeit creating new ones in the process)