I think the second one showed a lot of range for the director/producers. It has serious soul with strong elements of tragedy to go with the already-established effective pacing, good use of soundtrack, and tight use of motif. And all of that is accentuated, rather than overshadowed, by the incredible special effects.
Without the rest of the stuff, those special effects just feel bothersome and excessive. Like you're a moron being distracted with a shiny pair of keys. And that's my biggest problem with pretty much all other Marvel movies: they're all special effects and popcorn without inspiring any actual feeling. Even the famous "finger snap" moment didn't move me at all, because i didn't care about any of the shallow, shitty characters. Meanwhile, the death at the end of GotG2 was legit tear-jerking.
It also had one of my favorite montage scenes of all-time with the blue guy and the arrow.