I have had very limited exposure to Hickman. I only know him from his X stuff. He strikes me as Grant Morrison but with the heart removed. Mark Millar without the wacky nihilism Warren Ellis without the memorable character work It's big stuff, but he doesn't give you a reason to care.
It's like the dollar store version of big idea comics. Maybe I need more exposure but I'm trying to get through his Avengers and it's kind of a slog.