Possible spoilers.
I'm kinda torn on how I feel about the movie.
While in at least one way it reminded me of Back to the Future II (a super advanced future - just a few decades away) - it totally ignored the time paradox thing mentioned so much in the BttF series.
The time paradox thing I'm talking about is like this:
One cannot go back in time and then kill one of your parents - because then you would of never been born to be able to go back in time!
However, in the movie, there was an event so terrible, that it caused him to want to make a time machine in order to go back and prevent the terrible event. However, if the terrible event was prevented, he never would of made the time machine. Perhaps he would of made the time machine much later down the line, but it was just weird that he suddenly made it just to stop the one event that made him make it so quickly! And then - even when he went back and changed something, after failing just ONCE, he GAVE UP.
The moon concept/thing was cool.
The computer guy existing for 800,000 years made no sense.
English existing for 800,000 years made no sense.
In just hundreds of years, people in different locations all have different
versions of English (ye olde english vs current England vs American vs Slang American, Southern American, etc, etc). so why is it person A in 1890 sounds exactly like person B in year 800,000?
I couldn't make much sense of what was going on with the super-advanced underground human mind controlling the mutated predator humans. Like, why did he seem so civilized, and yet so monsterous at the same time? Why did he seem friendly to the time travler guy? etc, etc...