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I have never been a fan of Mark Millar in general. In my opinion his only great stuff is [I]Marvel Knights: Spider-Man[/I] with Terry and Rachel Dodson.
Civil War is bad, Old Man Logan is bad. Both were improved upon immensely by their movie adaptations, especially LOGAN whose shoes Millar isn't fit to shine.
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Millar's work from 10 years ago was a joke, and Millar's work nowadays is simply an embarrassment, but I would never view him as 'overrated'. Very few people rate him highly, despite his obvious commercial success.