I have a few bones to pick. For discussion’s sake, I’ll start with the most controversial: Grant Morrison’s JLA.
First: I crunched the numbers. 73% of the issues and 63% of the overall story arcs concern an alien invasion of some variety. A bunch of aliens invading and the Justice League having to run around punching things is fine for one or two stories, but it gets old when it begins to feel like that’s all the writer knows how to write.
And I’ll never understand why people were impressed by Prometheus. Much like a certain other Morrison creation, he has all of Batman’s bad habits with no redeeming qualities. He just is arbitrarily better than anyone ever, and has the perfect gadget to beat everybody, even when it’s completely meaningless technobabble (“neural chaff”) or there’s no way he would actually have access to the gizmo in question (When and where did someone make a weird neural disk of Batman’s fighting skills, and why is there only one person with the equipment to interface with these disks?). Then he loses because he literally forgets that Huntress and Zauriel existed.
And that’s just one arc. Throughout the entire run, Morrison seems to insist on almost coming up with interesting ideas, but then not following through with them or changing his mind halfway through. What is the Philosopher’s Stone? What was the point of the Wonder World characters? What happened to all the brainwashed White Martians (Mark Waid follows up on this, but Mark Waid is not Grant Morrison)? In one issue, Superman announces that the League is about to disband, but then at the start of the next issue their roster doubles in size and no one addresses the disbanding thing. The Starro arc focuses on some weird dream battle with the creature, but the invasion is actually warded off by Martian Manhunter pulling some psychic trickery. They give the entire population of Earth superpowers, but then summarily ignore that when Batman gives Superman a pep talk and Supers just punches some stuff and saves the day on his own.
This is why I’ve been stubbornly resistant to reading anything else by Grant Morrison. If this is supposed to be some of his more sane and legible work, I don’t want to see what happens when he’s actively trying to be incomprehensible.