Cullen Bunn seems set to become a rising star at Marvel. He is currently heavily involved in the Fear Itself follow-up comics. He is taking over Captain America and Bucky, which will become a Captain America team-up book. He is also taking over writing duties on Wolverine and he is co-writing the next Venom arc with Rick Remender.
Marvel wouldn't be giving him these high profile assignments if they didn't believe that he was a major talent.
Is he a good writer?