Mostly indifferent. If some catastrophe were to take out the entire Bat Family (but not Batman/Bruce Wayne himself) and Batman needed a new supporting cast, Duke would be as good a place as any to start. As it is, though, he's one more player on an already crowded field, and leads to the question, "Is this character really necessary?" NOTE: I asked the same question when Cassandra and Damian were introduced, and I remain pretty indifferent to them as well.
Buried Alien (The Fastest Post Alive!)