Just got back, it probably is the weakest of the three but thankfully not by much (disclaimer: I'm in the minority who likes Vol 2 best). Easily the best sub-series in the MCU, so I hope this is the theatrical end.
That said, I wouldn't be totally opposed to an episodic series following the new team.
As everyone has said, the Rocket scenes are masterful. Linda Cardellini in particular completely steals the show.
I'm glad they didn't just make the villain another Thanos.
I'm conflicted over none of the Guardians dying--I generally like when movie series have, ahem, courage, but I can't think of how it wouldn't have been repetitive of the Vol 2 ending...
Most importantly, all three movies felt DISTINCT from each other.