I like most everything Gunn did (Still haven't seen Supergirl, will probably be the one I don't enjoy from the sound of it), but it's never a great sign to have this at the start of a new run of movies meant to be tied together. At the same time I'm also glad to see Gunn return to a pure creative role as I think he's great at that, so it'll be interesting to see the next couple movies and to see where he goes next, see however long he continues with DC and to see if we find him returning to Marvel at all or if he just goes down a different path. I'd love to see him do some smaller, less casual appeal, projects like he did the story for Lollipop Chainsaw.
