Yeah, there were definitely some really stupid elements. For example,
The war strategy seemed really dumb.
Basically, they wait until the war is hopeless,
They only just invented Time Travel. They used it as soon as it was invented.
recruit a bunch of civilians who are scared and untrained, only recruit about 1000 per week
They ran out of military, before they moved onto civilians. That's millions of people.
which would not be enough to turn the tide of war anyway, don't even show them what the aliens look like or give them any intel, and just throw them into the war as canon fodder where only 30% survive. That's not a winning strategy. It seems the general was trained at the starship troopers military academy. LOL.
Lol.
And we see later that they order an air strike. Why not just carpet bomb the aliens? Why even bother with ground troops?
These things clear planets for colonization. They are a biological machine. They must breed like tribbles. Asexually and in vast number with geometric expansion. The toxins they already had clear men. Then a week later one woman has birthed a million new babies, who are soldiers a week after that.
And if you are going to order air strikes, why not just nuke the aliens instead of just having a couple F-22's drop a few bombs?
Also, we know future Muri has a plan to capture a female alien and develop the toxin that will kill all the aliens. So why not just recruit some elite soldiers and some toxin experts from the past to send forward to help Muri on her crucial mission? Why even bother with throwing canon fodder into the war that is clearly not working?
Time.
They need time to figure out the toxin, and then send it to the past. Which is no longer their past. The time machine created an alternate timeline, that could be saved, but the future did not have the tools to save the past until the nearly the end of the movie.
Frankly, I don't think recruiting soldiers from the past even makes sense. Why not send future soldiers and future tech back into the past to prepare Earth before the war even starts? That would seem more effective than just sending cannon fodder into a future war that is already hopeless. At the very least, they should have started recruiting from the past sooner when the war was not hopeless yet. Honestly, since the war was already hopeless, there should have been more emphasis earlier on preventing the war in the past from ever starting instead of waiting until the 3rd act of the movie for our heroes to figure it out.
I'm going to get dark.
Our world is over populated and it could stand to lose 4 or 5 billion people.
Why save the world from space monsters if it's just going to turn into MAD MAX when the oil and clean water runs out?
I did really like the father-daughter arc. But Muri did not want Dan to help with the mission to capture the female alien and did not want him to help her develop the toxin. So what exactly was Dan's purpose? Anybody could have sent the toxin back to the past, it did not need to be Dan.
She didn't know that he was coming in that reinforcement.
Are you suggesting that she was waiting for Dan until she started working on the poison?
Or that she was pretending that she didn't know that Dan was coming with that intake?
Or did she designated exactly when Dan was drafted to coincide with the creation of the poison?