His ideas are fantastic. Execution and characterization are spotty. Been a while since I read anything of his, but IIRC, he has a tendency to dip into surrealism or absurdity that feels cringey instead of his artistic target.

In some ways, it's similar to a lot of Golden Era SF. You read it for the ideas, not the story.

I do have a favorable opinion of him and his work. I'd really enjoy Doctorow being paired with a traditional fiction author and both being rode herd by a hardass SF editor.