Annihilation movie review

By the way this has spoilers.

I liked Annihilation.
It was a good movie. Good plot development with diverse characters that are intriguing, interesting and likable in their own way. The graphics were great and the ideas behind the movie was great as well.
Quick synopsis is that a biologist/ex-soldier travels to an unknown, alien 'shimmer' zone to find out what it's all about, to find a cure for her husband. Her husband is a soldier who traveled into the shimmer before her as a consequence of... something I can't say because it'll be a spoiler.

I just quickly wanted to write this review because, as usual, I just couldn't shake off the small annoyance I had of the movie in the back of my mind.

Annoyance 1: I hated how they just didn't get out after getting a good sample of the materials in there or the idea of what was happening in there. This part just leaves a whole tonne of questions of what the former troopers did when they went into the shimmer. Maybe in the book they've explained it further, maybe in the arc, they've done everything I would've thought of, but didn't portray it in the movie, because it'll make the movie too long. But really, if there's an entity that engorged everything that entered it, then one of the things I'd do, (or any sensible scientist) is to send someone in just to get out immediately, just to give a sense of what it's like. The only basis that we have, of a reason why they can't escape, is that as soon as they enter (or not? since we're not told when they lose their memory??) they lose their memory and end up in a semi-random location. But this seems weird, because they seem to have a sense of direction towards the lighthouse and a sense of where they are looking at the sun or even the base that was abandoned... so my question is, what happens when they try to go back? If other groups have tried and not succeeded, that's fine, but can we at least have some hints that they've done it because without that, it just seems like either bad exploration practice, or a tremendously bad decision from everyone who've entered this place.

Annoyance 2: bad team choice. I mean, the main leader was someone who hand picked the previous teams, apparently being very cautious through psychological screening and testing... but let's look at the current group. No one, (except Lena who only volunteered AFTER the current team was built) had combat experience. It's like no one cared about the guesses on why the previous teams failed. They theorized that the team got attacked or the team went crazy and killed each other. Well ok, if that's the case, then have you tried just sending one person in? If you have to send them in as a team, then... like the groups before, shouldn't you send in people who can handle stress and pressure? Josie is already shown to cut herself for unknown reason, Anya is a paramedic who seems to be hot tempered, and clueless about the expedition from the beginning. The notion that the only groups sent in before were armed forces is also questionable. No scientist before this expedition? Are you kidding me?? What were the actual missions of the previous armed forces? "Get in there. Go randomly to the lighthouse. Collect what you think is 'data' and maybe come back out"?? I'm pretty sure they had scientists in there, but I don't know... The whole explanation was poor. In any case, the current team's failure was a bit imminent, just because of the composition.

Annoyance 3: She had a grenade. She didn't use it wisely. When she did, the doppelganger who was previously mimicking all her moves... decided not to follow that one move of her running away frantically. Also this weird alien species who seemed to be immune to gun shots and is incredibly strange to the extent that it has no conceivable form except some weird shape shifting Mendelbulb or whatever it is, is... weak against fire?? wow... just wow... I mean, everything indestructible needs a Achilles heel right? Like superman with kryptonite... but my annoyance is that why did no one find out about it until now?? So what did the previous expedition guys do?? Go to the light house, poke it with a stick and run?? I mean, you seriously can't tell me that this expedition people were the first ones to actually stay sane until they got to the lighthouse. sigh... in any case.

I don't know. Overall, as I said, the movie is good. Just... had some annoying moments. I'm guessing the book was better?