Finally made the time to see it yesterday, well after the crowds were gone (afternoon matinee, maybe 6 or 7 people in the theater, including my family of 3). Also, my first time with IMAX 3D. Not sure how much the IMAX part added to the experience (maybe spoiled by my HD TV at home), but the 3D was better than I expected (haven’t seen a 3D movie in decades, so, yeah, technology). Neither of these things impressed me enough to buy tickets for them in future.
Now to the movie. Music was excellent, but I grew up during or just after many of those songs, so. Story progressed along satisfactorily enough for me, and the explanation for why most of it happened was also good enough for me. I saw character growth in each of the Guardians, which was a plus. Humor seemed to be there not to push the movie toward being a comedy in places, but as facets of the personalities and/or cultural disconnects between characters. Of course, the laugh-out-loud part for me was the stinger with Drax and the growing Groot.
Another poster up-thread called this a ‘getting the team together’ movie, and I agree with that. The ‘origins’ and motivations of the characters were explained without sounding like it was being read off of cue cards or sidetracking into long and laborious exposition, and as I said earlier, each of the Guardians grew (to one degree or another) beyond the places they were in when they were introduced.
One nitpick that made me frown: Nebula’s facepaint (or different parts of her head, or whatever that was supposed to be) was very sharp and clear, and fascinated me every time she was on screen. By contrast, the black streaks on Ronan’s face looked like the makeup artist assigned to that job let his toddler do it instead. Blotchy. Even facepaint applied by fingers (as this was shown to be, IIRC) is pretty much always better than that. Witness facepaint applied to braves going on the warpath, the black streaks under the eyes of football players, etc.
I remember the film kept my full attention the whole time (screw you, bladder!) due to a combination of keeping up with the story and focusing hard on the 3D aspects (my first time with 3D, if you recall). I walked out of the theater satisfied that Marvel had taken a bunch of unknown characters (I remember the '70s Guardians; haven’t read comics in like 5 or 6 years, so knew nothing about any modern take on that team), combined them with a decent story, and made another good movie that will eventually sit on my shelf. At this point, IMO, DC might as well get out of the movie business–Marvel is throwing a lot of movies against the wall, a few of them dreck, most of them good, and a few are excellent at least. Still, Marvel is doing it right for the most part. DC’s track record is spotty at best, which is disappointing. They can’t all be The Dark Knight, but come ON!
In conclusion, I believe I’d watch this one again in theaters, will buy the Blu-Ray when it comes out, and my grade for Guardians of the Galaxy is a solid B, possibly higher.