I think the second half as presented in this video is like, basically if a comic book could have music. Hearing it made me feel like I was walking around the shitty Marvel sector at Universal lol. It has the right amount of color to it IMO.
The score for Aliens was only completed in four days, and very shortly before release. A two month window is almost a luxury. Also you have to remember that a lot of scores are done after the film is very nearly finished, because the score has to be composed to match up with visual cues in the scenes.
Although generally speaking, I believe the score is mightier if it is worked on for a long time. For example, Howard Shore worked on devoloping the various themes of Lord of the Rings for quite a long time before the score was actually recorded.
One thing I'm hopeful about is how Rian Johnson is approaching The Last Jedi. Rumours have it that he is going to edit the film around John Williams' score, which based on recent Twitter teases, is already being recorded...