Even though the film is getting fairly positive reviews, I imagine James Gunn must be pretty disappointed. Considering how long he's been working on this and given how he's spoken about to how committed he was to really "topping" the original in every conceivable way, having the sequel judged to be inferior must be a bit of a blow.
Incidentally, I really don't agree with the people in here who are stating that the first film would have been "difficult to top", and that any efforts to improve upon it in a meaningful way were most likely already doomed from the start. I think that coming into this film, Gunn had the immediate advantage of not needing this new story to be tied down to any of the usual woes that follow origin stories, primarily not having to dedicate the entire first act of the film to setting up this universe and all its key players. Admittedly, I wasn't a huge fan of Guardians of the Galaxy. I felt most of the characters were shallow, cookie-cutter archetypes who were all unanimously under-serviced by the script....transitioning from cut-throat enemies to wise-cracking best buds who cheerfully announce themselves as "family" far too quickly. Not to mention, that movie featured the most hackneyed, shallow central antagonist I think I've ever seen in a comic book film. As a result, I felt this film had a lot of opportunities to really build upon the foundation laid out by the first film....by going a lot deeper with its characters and their subsequent motivations in a far more meaningful way. Given the initial critical response to the sequel however, that doesn't appear like it will probably be the case for me.
Obviously, I haven't seen the film myself yet...and of course, it's still relatively early days in regards to the film's critical reception, but going by some of the specific comments in these reviews, I'm left a bit disappointed. I hoped this would finally be the film where I could finally get onboard with Guardians of the Galaxy by giving me the things I felt the original so sorely lacked, but this film doesn't seem like it's going to do it for me either.