I agree that this doesn't follow the Alien/Aliens model to the T, which is good. Though I think most of the cast in Alien/Aliens behaves rationally (excepting the bad guys), their plans and reactions are very survival driven. The space truckers want the thing out an airlock, the marines want to blow up the colony. Both of those are very not-Starfleet ways of dealing with the unknown.
A thing I like that they're doing in the finale, and in the other Gorn eps, is making them genuinely "monsterous" in how they cull and breed using sentients as cattle. This is just not something that can ever be tolerated by or within the Federation... the way they run their society requires prey, and even the klingons have found more civil ways to satisfy their militaristic thirst.
I am happy that the crew has settled into a "just kill all of them" consensus to these horrible-ass space monsters. The conflict here is in how curious Pike and the crew will continue to allow themselves to be: Why do they do this? What drove them here? Was it the solar flare, or are they expanding militarily? The Federation fears the military possibility enough that it now colors how they're looking at this. I like where that puts the characters. They are not at all inclined to take a sober look at this situation, one of their very own was killed by these things. It reminds me how the bugs in Starship Troopers were technically reacting to colonizing efforts by the fascistic humans, and how that fact was quickly buried in the propaganda.
I expect and hope that part 2 is going to add a lot more nuance to this situation, because it's potentially more interesting than a bug hunt.