Like he said,All shooters are alike in some way,But every one of them has something unique too,halo has sheilds,gears has the cover system.
Basically with Forge, Halo 3 can copy any game it wants, badly by the way. If anything I think it should be compared to Resident Evil 5. Boths game are Third Person Shooters, Res 5 has a very rudimentary cover systems. When I first saw the satellite laser in Res 5 I said, "Dibs on the Hammer of Dawn." Aboot the Similarties you listed. Hunters - Boomers Hunters are a colony of worms inside a set of armor with a laser cannon and shield. Boomers are Retarded Locust on steroids. Strong and Slow Infantry isn't new. Flood - Lambent Flood are Parasitic Organisms who morph the **** out of the hosts body. Lambent are Locust who fell in a pile of nuclear waste and are now glowing freaks. If anything The Flood are more like those Pod Freaks whose name slips my names. Both are very resilient and look similar. Types of Brutes - Types of Boomers Not really, many games have different types of the same unit. Hammer of Dawn - Spartan Laser * Completely Different Horde - Firefight (and **** Zombies) * Granted Horde is a good idea and it would be stupid not to make your own take on it. So Far **** Zombies is Awesome and I've been waiting for a Halo version of it anyways but the idea of holding out against huge masses of enemies is not a new concept so I can't give you that one either. In Halo 3 an all out attack by the humans/elites was staged against the Covenant - In Gears of War an all out attack was made on the Locust A Hostile Invading Force attacks Humans, Hellbent on killing all of them. Every Alien Movie Ever Made. Elephant - Derrick They look kind of the same from the front and both serve to deploy troops. Drop Pod - Grindlift Once again same purpose, different way. Looks kind of the same but all pods look like that. Missile Pod - Mortars Launchers** No. That's it. Flamethrowers** The Flamethrowers are both presented in different ways and is not an original idea. I know you said you know it's original but whatever. Movable Turrets** A Movable Heavy Machine Gun. Gears of War you can place it and they both look different but I guess I can give you this one. Oh and for the record Halo/Marathon and Bungie are one of the longest and Best Known FPS/Studios and helped get the FPS genre going. id was the first though with Wolfenstein and Doom.