Overall this is a very solid track. Gunn speaks well and thoughtfully about all aspects of the film. He goes into a lot of detail about the script including backstory and deleted moments. He gives a lot of kudos to the cast and crew and discuss their various contributions. He gives a lot of time to the songs (obviously!) he selected and the score also (which is nice he gives credit to it considering how much of the film is songs). He also talks about his inspirations, from Star Wars to spaghetti westerns.
My only real complaints are that he spends a considerable amount of time talking about all of his friends in the film and at least once repeats a shout out; the other minor issue is that sometimes his comments come across as unfinished as though he is interrupting himself with another anecdote and never comes back to the first one.
Other than that a fine track and is good enough for not just the hardcore fans but anyone remotely interested in filmmaking. 7/10

He mentions about the shooting of the location in London during the dreaded heatwave of 2013, (Tell me about it!) and all the actors in heavy make up and costume.

He talks about the comic and how characters from the source material had cameos.

He mentions that Benicio Del Toro and Michael Rooker would come to his house in London and they would hang out. They're best mates.

A pretty strong commentary. He spends the majority of the time patting people on the back and complimenting them, which can be a bit excessive. We get it, so-and-so did a great job and you loved them. Backstory and music are the filmmaking aspects that he covers the most.

And as reidca pointed out, James also spends a lot of time pointing the numerous cameos of his friends, family, people he knows, friends of family. Nearly every character in the movie that isn't a lead is identified as "that's my brother", "that's my brother's fiance", "that's my old high-school friend", "they're a friend of mine", etc..

FUN FACTS:

-The gravelly Sakaraan voices are James Gunn and his assistant, Simon Hatt.

-The hologram of the dog that Quill encounters on Morag is James' personal dog.

-Yondu was written specifically for Rooker.

-When the casting director suggested Chris Pratt for Peter Quill, James thought that "it was absolutely terrible" because he could only see Pratt as the fat guy from Parks & Recreation. Be the casting director kept pushing for Pratt and James was eventually won over at the audition.

-He admits to being forced to shoehorn Thanos into the movie - "because he doesn't really have anything to do with the story, but he serves a large role in the cupcoming cinematic universe".