The Fearless is alright but nothing spectacular, and Battlescars and The Deep are and were (respectively) awful. Bunn talks a good game about his upcoming Wolverine arc, but so did Daniel Way a few years ago. All I can say is I haven't been blown away by anything he has done so right now my expectations remain low.
I heard The Sixth Gun is supposed to be great but I haven't read it.
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I have. It's not bad, I wasn't a massive fan of the overall arc but it had a pretty interesting ending and I thought it was pretty cool how Wolverine was the only person who could see The Watcher. Not sure what to expect for the "Killable" arc but it sounds pretty intriguing.