LOVED IT.
Fair disclaimer is GOTG1 is my favorite MCU film and my favorite Marvel film. James Gunn only really makes one kind of movie. If you vibe with his humor, style and pacing, then this will be your bag. If not, I don't know what to say, everyone is different. and I respect those alternate viewpoints.
Whatever people think of Gunn, he made people give a damn about a talking tree. And now he's made you give a damn about basically a stuffed animal that talks like George Carlin. Better than the 2nd ( which I felt was compromised because it had to adjust for the rest of the MCU storylines for the Avengers films ) but I wouldn't call it better than the first.
My personal rankings -
GOTG1
CA - TWS
( Blade II - People can argue if the Blade films are MCU films, but I'll see them personally as Marvel films)
CA - TFA
( Blade I)
GOTG3
Thor Ragnarok
GOTG3 moves up the food chain and is IMHO better ( for me) than Thor Ragnarok, which I love almost as much as I hated Love & Thunder. I am not a huge comic guy so I don't know if Adam Warlock here is in line with what hard core comic fans would want out of him. There is heavy fan service in this film. But it's the swan song so I'm OK with that personally. It's not perfect, but you can see the actors want to be here, they are having fun and they also love these characters too.
Would I categorize this as a film worth a trip to the movie theater? ( i.e. like LOTR original trilogy, Matrix, ESB, Interstellar, The Dark Knight, Pulp Fiction, Heat, etc, etc)
For me, the answer is "Yes". But again, I'm biased.
From the industry side, I got some rough casting confirmations for the new Gunn DCEU. If you like the actors in the GOTG universe under Gunn, you'll probably see them again very soon. Basically the same core character themes, just different names and costumes. Whatever some people think of Gunn's releases, internally, lots of people love to work for the guy.