Grant Morrison really saved the Justice League during the 90's. Their members were forgettable and yawn inducing before Grant Morrison said he wanted the big seven to shake things up. Yes, blue Superman is used after the first story, but it doesn't last forever. He was just trying to make his stories feel like they were in-line with the other writers books.
His stories were so good that when Bruce Timm and Paul Dini launched the Justice League cartoon they actually drew inspiration and followed Grant Morrison's first JLA story. Over every other possible story they could've used. Just be aware how the Justice League does hit some bad parts if you do read 1997-2016... It's bound to happen. Dwayne McDuffie's run is pretty terrible.