People didn't like it because the creature didn't seem realistic

Rating: 9/10 (14 August 2017)

I've been reading reviews of this movie and it seemed many people didn't like it because they thought this carbon/water based creature was unrealistic. Nothing can survive the vacuum of space, extreme cold and extreme heat, no water and food for years, etc... but there IS an organism that can do that. It's called a "tardigrade" - this little creature can survive lethal amounts of radiation, 1 degree above absolute zero temperature, it can turn its body into glass to survive extreme dehydration, it can survive the vacuum of space and the pressure of many hundreds of meters underwater and survive above boiling temperature.
Coincidentally, shortly after learning about this fascinating creature I came across the movie "Life", and that's probably why I love it so much. What would happen if a hostile alien with the durability of a tardigrade and a lethality of a xenomorph decided to hunt us down? I was thrilled at the prospect! Although some will fault some of the poor choices of the characters, I found them on par with the choices of "Alien:Covenant" characters, but I wasn't going to fault the movie because the premise intrigued me so much. I for one, found it an exciting and thrilling movie!!