Originally posted by: BenSkywalker
but imo it was simply an evolutionary step for the fps genre. it took what was already there and extended it; it didn't redefine the genre.
I'll give why I thought it was revolutionary-
'Atmosphere'- and this was the biggest area. Games prior to HL had maybe something resembling a story to give you a reason for blowing everything up, HL took it much further and made you entire gaming experience directly tied in to the storyline of the game. The way in which they did this was brilliant. Instead of running in to someone who throws all the answers at you, or reading/listening to some narrative, you are simply thrown in the middle of it and have to try to piece together what the hell is going on. There is no instance in HL where you ask yourself- 'Why am I fighting this guy/thing'? Also NPCs but I'll cover them seperately.
AI- It had it, nothing before it really did. Prior to HL there was 'aware' and 'unaware' AI, they may get complicated enough to try and dodge once in a while, but nothing was like the quantum leap going from titles that came before it to facing the Marines the first time. Then to shock you a bit, you reload after they wipe the floor with you and they don't do the same thing. HL's AI was the first to make you think. Sure, it has certainly progressed far since then, but nothing around prior to it was close.
Useful NPCs- HL's addition of NPCs not just to relay information, but to aid you in your quest through both completing certain tasks for you and actively participating in combat. Picking up a 'Barney' for the first time and having him lay down cover fire for you, and then seeing him getting whacked because you didn't return the favor? Elements like that helped pull people into the game.
Three(four) way- It used to be you versus everything that moved. Half-Life introduced the concept of your enemies having their own enemies. When stumbling upon a firefight between aliens and Marines I would regularly sit back, firing occasionaly to help even the odds, and wait until they were done to go finish them off. Then you had the 'black ops' and it still isn't clear if they are 'good' or 'bad', actually, outside of the aliens it really isn't clear who was 'good' or 'bad' throughout the game. Half-Life wasn't black and white, there were motives behind what each element was doing, and how you viewed those motives depends on how 'good' or 'bad' the other scripts in the game came across to you.
I won't argue against CS's importance in the multiplayer community, however a lot more people played HL then CS over the years(although obviously you have a lot of people that spent a
lot more time with CS). Online multiplayer gaming is still small compared to the single player market, though CS did do an awful lot to help narrow that gap. I would say that CS was certainly revolutionary in the MP market, as was HL in the SP market IMO.