When I was a quarter of the way into the game there were two things that stood out for me. Focusing on a single playable character in comparison to the Avengers game from the same studio was absolutely the right move. While it wasn't a terrible game by any means, structurally, the Avengers game felt like a sprawling mess by the end.
The other most important thing that stood out for me in the Guardians games was how incredibly funny it was. Every new situation I encountered in the game was a delight just to hear the banter between all the members of the gang. The writers absolutely nailed this aspect of the story. The humor emerged not from funny isolated jokes but from the actual personalities of the characters delivering their lines with absolute conviction by the wonderfully cast voice actors.
While the overall tone of the story gets much more serious by the end, by closing time you will still remember the games as a class above when it comes to funny.
This got me thinking about how few games I remember for their humor specifically. I tend to have a weaker memory for modern games but when I tried to recollect games, I consider the funniest, two games came to my mind. Not surprisingly they were made by the same studio.
Giants: Citizen Kabuto and Armed and Dangerous were both made by the long defunct Planet Moon Studios. When I thought about these games, I opened up metacritic to see if it was just me that held this view. I was not wrong.
Dig into the reviews and while the gameplay may not get the best marks you will see many of them mention something like "One of the funniest games I have ever played" Having played both back in the day I can attest to this fact. It's a shame we never got to see anything more out of the studio before they shut down.
I highly recommend getting your hands on them and playing them just to experience humor the likes of which we rarely see in games these days.