Bunn. While his Magneto gets the praise it deserves, his Blue work would probably get much more praise if editorial wasn't both horribly derailing his current plans and passing up on his amazing future ones. Thankfully, he's out of the X-Office and with sensible folks.
His evil twin Hopeless also goes kinda unacknowledged for being one of the best teen writers in the business. He should really get the very long run he deserves with some young characters, but I guess he's off X-Books too?
Also, Jason Aaron. Don't have to explain how good he is. Almost made us remember that the X-Men are about a school. And that schools are about kids. Wish that had stuck.