Yea honestly, the worst aspect so far looks to be the Nova Corps. those uniforms are terrible. hopefully they're only in the movie as a generic police force.
As far as Moondragon, she could still be alive. Without going back to look I don't think he knew Heather was still alive at first, when they took her to be trained as a warrior monk. Could be a big part of a sequel too
Rocket's backstory is actually pretty great. IIRC, he originally was an ordinary raccoon, but this planet Halfworld evolved a bunch of lower animals to sentient intelligence to use as fluffy security guards for an insane asylum. Or something like that. its awesome haha
and sadly I don't think we can expect the Starjammers, they most likely fall under the X-men license
this movie has an interesting image of Kree so far though, I like it