Correct, and I will make an attempt. First, he is a very realistic writer. He's got political parallels to things happening in the actual world and real things that corrupt our communities. It's very interesting to see how that plays out. Just the things he did with Magneto, for example, was so similar to that of Bin Laden or whatever other terrorist you could imagine that was arrogant enough to put his face on a video camera and say that America deserves what they get. He's a very good writer in that respect.
He loses me, though, with his dialogue and stories. His stories are flat, really, and rely on aliens and more out of body things than most writers today. Also, the dialogue explains most of what is actually going on and tells too many things about the character at inconvenient times. For instance, in MK Spider-Man Vulture is carrying Spider-Man before he drops him and is going on and on about why he is a villain. "He needs to earn a few extra bucks for his son who was locked up in a jail in Delaware for a felony he supposedly didn't do. His son had a family and daughter at home" etc. Just things that people wouldn't really say.
Lastly, he's a very cinematic writer. He can write huge events and play them off well. For example, the nuclear explosion that took place in UXM in the final arc, Return of the King. You got a sense of a frantic, yet heroic effort from the likes of Prof. X, Jean, Roguee, and Nightcrawler. He also did this in the epic battle between the Skrulls and the Ultimates. Truly a work of art!
I think I covered him.