Out of all the Marvel Movies, Guardians of the Galaxy usually has the best use of humor in a movie and is more lighter fare. This one still has the humor, but takes more of a serious tone. It was enjoyable to learn more about Rocket's backstory, but more often than I would like the jokes fall flat.
It still doesn't take away from the fact it was an enjoyable movie, just not on the same level as the other two in my opinion. Non Spoiler: There are 2 After credits, one at the very end of all the credits that is nothing of note.