So I watched Guardians 2 last night, fun time was had. Not gonna write a long spoiler-ish post so let's keep it somewhat short and simple for now.
1. First Guardians is better, but Volume 2 was funnier. Similar to Avengers and Age of Ultron, this time they went for more jokes and a lot of them hit.
2. The characters are all still great and likable and the new additions work really well
3. Main problem is the story/structure. Without spoiling anything, You don't really know what's happening until the last 30 minutes or so.
And while 3 is a somewhat big problem that has sunk other superhero movies, for me 1 & 2 helped making up for it a bit. It falls towards the bottom half of the Marvel films but because the characters are great and most of the jokes hit, it was a really enjoyable experience even though there were no real signs of where the movie was going until the second half.
So would still recommend.
ALSO, there are FIVE post-credits scenes this time. So if you care about those, don't leave after the first 2 post-credits scenes like some people did.