Don't worry, Halo is a masterpiece of a game in my opinion, but just think about it for a minute?
The Flood in Halo operate the same way and require the same food source as the aliens in the movie Alien: both are parasites, both transform humans into them, both need a host to reproduce or consume to continue their existence, both are hideous, etc.
The troopers and the marines: both uses bullet ammunition, both have similiar looking guns, both almost use the same transportation, etc.
The Pelican in Halo looks exactly the same as the Cheyenne in Alien, but the Cheyenne has most horizontal fins.
It's like the creators of Halo have finished watching the sequels of Alien, so now they want to make their own by using a lot of ideas from Alien.
Don't you agree?
The Flood in Halo operate the same way and require the same food source as the aliens in the movie Alien: both are parasites, both transform humans into them, both need a host to reproduce or consume to continue their existence, both are hideous, etc.
The troopers and the marines: both uses bullet ammunition, both have similiar looking guns, both almost use the same transportation, etc.
The Pelican in Halo looks exactly the same as the Cheyenne in Alien, but the Cheyenne has most horizontal fins.
It's like the creators of Halo have finished watching the sequels of Alien, so now they want to make their own by using a lot of ideas from Alien.
Don't you agree?