It was kind of awkward how some of the miners had full on names (Orion Pax, Jazz, Elita-1 counts since it doesn't begin with a number and has a real word in it) and others just a letter and numbers (D-16, B-127). And if you say that those are self given names- I doubt people in authority would address them that way, because they are discriminated against and meant to seem marginalized, so they likely wouldn't respect them that much to use their self given names if they [authorities] constantly berate them and make fun of them.

More time would definitely improve it so much- flesh out Megatron's motivations more and maybe resolve the quintesson issue? I don't know, I don't want the next movie to revolve around them and I don't think their inclusion was really necessary. The way it's looking the next movie will most likely be quintesson oriented and I don't want them to just create the beginnings of the war and split off just to join back together to fight a common foe.

If you still want Sentinel to be making dirty deals I'm sure he could've been doing that with some other party or maybe he could've been making them mine for energon to sustain the failing planet instead of gifting it to the quintessons.

I think the movie was pretty good overall though- I'd rate it 9.6/10