Why all the bad reviews?

Rating: 7/10 (5 August 2018)

I enjoyed this movie and can't believe how many bad reviews they are.First off without giving to much away, Just because we can't survive in Space don't mean a Alien couldn't.As for burning the Alien,The Alien was running plus they have found microscopic organisms living near volcano In extreme heat under the sea here on earth which they through was not possible fact. There are Trillion and Trillions of planets. So why could there not be a organism smarter then us?? Remember it's a movie made for entertainment.