Yikes.
Meandering. Flat. Forced. The original might be formulaic in many ways, sure, but there's a casual, self-assured coolness to it. It's brisk, gets to where it wants to go, and is totally unafraid when it counts. None of that carried over to the sequel. Pacing grinds to a halt to stare at Baby Groot because Baby Groot is cute and everyone loves Baby Groot, have more Baby Groot. Pacing grinds to a halt to force characters into awkward on-the-nose bonding moments that no one seems to want to be in the room for; well, when they're not just yelling over each other obnoxiously as if they're rewinding back to the beginning of the first story, rather than acting anything like the comrades they've become. Animators seem to be told to fill in the ubiquitous disjointed green screen background behind every static character shot with a thousand frantic explosions. Recurring traits and jokes play out as bizarre, slow-motion-winking hyper-aware fanservice rather than as straightforward character continuity.
Trying too hard.