So we've gotten two books with co-features. I liked the Manhunter one, but I was a fan to begin with. I didn't like the Blue Beetle one, but I'm not a fan of him, and I'm kind of disappointed that since I already buy Booster Gold, I have to get saddled with this second book.
Overall though, most of the co-features have me excited. I'm really looking forward to the metal men/doom patrol book.