WTF?

Yeah, I'm gonna echo this sentiment.  WTF.  Half-life and Halo are completely different styles in almost every way.  One is a scientist battling through an oppressive post apocolyptic alien force as part of a small resistance. The other is a military commander in a large army battling against an alien race in a full scale planetary war.  Both are action, but one has horror elements.  One has puzzles; the other is nothing but mindless shooting.

The only thing they really have in comon is aliens... which isn't saying much.

Oh noes, headcrab and flood conspiracy!

Halo 2 and Half-Life are very similar in the way that the story is presented to the player ... Which is (basically) true of all FPS that have been released since Half-Life. This isn't (necessarily) a bad thing because the best way to become great at something is to copy the best until you can replicate their success, and then improvise. Many fools who believe that they're smart tend to improvise before they understand why something works and tend to have very short lived success or fail.

 No I'm meaning the basic elements ofthe gamplay. Its easy to make a map stick 1000 enemies and tell the player run through it killing everything and have a few secret thngs along the way, thats just basic FPS style.

Yes I'm meaning partially on the headcrab/flood thing but thats an old and obviosu argument that doesnt need to be echoed.

Let me take Halo 3 vs Half-Life 2: Episode 1 for a second. I would take Episode 2 but Alyx's AI greatly improved. 

The whole two character team up. Master Chief and the Arbitor is shockingly similar to Gordon Freeman and Alyx's ream up.

The gravity hammer thing.. umm... took the basic consept of the gravity gun, removed the attraction ability. made it have to connect with something to launch the object with a massive amount of force. 

There are so many similarities that its not funny. SMG vs SMG. The guns are 95% identical. You would think that Bungie would modify the damn thing a bit more. 

You're really stretching this, but I'm still going to waste time responding.

The Arbiter is thrown into the game and hardly makes an difference, unlike Alyx playing a major role in EP1. Hell, he's not even present for the majority of most missions.

Gravity hammer is a ripoff of the grav gun? You really need to play more games and see what a real ripoff of the grav gun looks like (Doom 3 expansion)

Its an SMG, what the hell do you expect it to handle like. But to humor you; maybe Halo ripped off SWAT, because the SMG is just like the one in that game too. Actually, screw this argument - you cant dual wield the SMG in HL and both games came out near simultaneously in 2004, with the SMG in Halo being shown off ages before that. Oops.

If Halo rips off anything its Aliens, and thats a lot more than some contrived similarities. Seriously, quite playing games and ingest some popular culture and science fiction. Maybe then you'll see that HL is hardly as original as you think, and you'd see some of the real major influences on Halo. Oh, and play something besides HL. Its not the only game thats influenced FPS development.

 That is the exact reason why I laugh every time I see the words "Halo clone".