(1) Less aliens? Is this meant to be a joke? Did you see how many aliens were in the Mos Eisley Cantina scene? :facepalm
Yeah... and this is something tha's bugged me since the prequels.
In the OT, we had (ANH) Mos Eisley (on Tattoine), and that was pretty much the only place with aliens.
ESB, aside from Yoda and the Ugnaughts on Cloud City, not a lot of aliens.
RotJ, Jabbas Palace (again on Tattoine), Ewoks, Admiral Akbar and Lando's copilot.
The prequels... I felt like they just threw in new aliens at every opportunity just for the sake of doing it. The galactic senate place with countless delegate pods where it seems more like they're representing every race of alien versus just every planet in the system.
In places/scenes when it could just as easily have been a human character, you end up getting aliens. The scene where Obi wan takes that Camino dart to the fat thing in the 1950's robot diner always comes to mind.
Whether it's driven by the wow factor of "let's see what else we can come up with" or for the sake of merchandising and having something more than just humanoid character action figured on the shelves of Wal-Mart... I feel like they've overdone it with no real reason.
Not to mention they're all CG. Part of what made it cool in the OT was they were Muppets. It's like CG just makes it easier to just arbitrarily create new races of aliens just to plug them into a scene.
The fact that we're seeing new aliens in every movie, begs the question, where were they in all the other movies?
(2) I think the general goal was to show that the First Order is made up of remnants from the Empire... it isn't an organization that has existed and thrived for generations like the Empire did, and so they've used very young officers to show that the ranks have been filled with whomever dared, I suppose. I thought it was a good move, since they are implying that Snoke is the master manipulator, and he has likely chosen young underlings because of their passion and ease of manipulation.
I get that but I still feel like there should have been at least a few of the older, seasoned Empire guys left. Kind of like how there are still old Cold War-era officers in the Russian military. Even if it was one or two old dudes as the Generals... with Hux trying to weasel his way up the ladder by killing the old guys off... that might have worked better for developing his character a bit.
Not knocking the movie... it was great. These were just little things that bugged me, but not enough to ruin the overall experience.