I think it would be easier to tell you the times WCW was good.
Early WCW is plagued by the Turner execs trying to take the blood and seriousness out of southern wrestling. And asking for it to be this impossible combination of a sports based presentation and a knock off WWF where there's a bunch of gay gimmick wrestlers for retarded children. This is when you get the shit like the Ding Dongs/Arachnaman, and boring shit like battle bowl. and the Sting vs Flair feud is surprisingly dry and bloodless compared to Flair's earlier work.
92 has it's gems. Flair is gone, but we get the dangerous alliance. Bobby Eaton and Arn Anderson are ring generals, Rick Rude doing the best work of his career, heat magnet Larry Zbyszko and future GOATs Steven Austin and Paul Heyman. Opposed by Sting doing his best work without Flair to carry him, Barry Windham and Steamboat who put on the last great performances of their careers and Dustin Rhodes is more than holding his own. Later in the year you get Vader and some rare American appearances by the Miracle Violence Connection. This only gets better when Flair returns and it just keep getting better in better until March 1994 when Hogan shows up, and Starcade goes from Vader vs Flair, the best American match of the 90s, to Hogan vs his best friend the bootyman. Shit gets gay for a long time.
At some point all the Hogan bullshit is offset by the strong midcard, and the NWO grows to such proportions it can't help but have some decent workers in it. And then it falls off one last time whenever you personally realized that this NWO shit isn't going to have a satisfying conclusion and all the least interesting workers are just shuffling their on screen allegiances to make sure they don't job to anyone but each other.
Personally they were at the point of no return with me when they opened nitro with "All this show is fake, and we hired the fake writer from the promotion you don't like to write storylines for our fake wrestlers."