I'm not sure how unique I am, but I'm the sort of writer that much prefers the editing process to any other part. First drafts are painful for me. Even the first draft of this blog post is making me squirm.
But once I overcome that, I can fly through multiple drafts of the same piece. I love editing. My stuff, other people's stuff, it doesn't matter. I love it.
The reason I work this way is probably perfectionism. No matter how slowly and thoughtfully I write, I will never put out my best work on my first attempt. For some people, that's comforting -- they know they just need to get the general idea out on the page, and then they can come back and make it better later. But there's a psychological hurdle for me on that blank page. Even though I know the work won't be perfect, I still have a hard time putting it down in its unfinished form.
Is that unusual? I feel like most writers I talk to love getting their initial thoughts out on the page and then struggle through editing. Maybe it's just the crowd I run with, I dunno.