Grant Morrison is, to me, the poor man’s Alan Moore.
I used to think that and a lot of online conversation is a simplified Moore V's Morrison debate. I think this is largely down to the comments GMo has made about Moore and the way Moore responded. He seems to have a real chip on his shoulder or inferiority complex about his writing.
Morrison is a talented writer but he's never had that celebrated level of genre defining story to stand over as his the way Moore had Watchmen. Invisibles is amazing and weird but it's too out there for the average audience, However his contributions to properties that are not his own are where he has shone.
It's going to sound silly, but his Superman story titled with the very forgettable "All Star Superman", is the example of a Good superman story, it is character defining, loving, warm, funny and well written. Whenever someone says "Superman is a boring character" I point them, to this.
Doom Patrol is one of my all time favorites and I could go on about that at length but we already have comic threads so I wont derail further to gush over that.
Netflix produced Happy! which is one he wrote for the screen I think, so I wouldn't be surprised if they publish Invisibles.