What's your favourite Valve game and why?

I'd go for Portal 2 or TF2.

Halflife 1998, because of the impact it had. Nothing like it. Changed FPS.

Halflife 2 is objectively the better game though imo,

Probably just Half-Life 2. Didn't really have a lasting appeal to the other titles on their list (Portal, L4D, CS:Go).

Too bad the company is total shit-fest nowadays.

Half Life 2

Counter Strike back in its heyday

Half Life

Portal (have yet to finish it lol been playing it for years)

By a mile Portal 1 and 2

Those games are great.

on second place comes half-life , the game that made FPS a major genre.

@cub: Probably Team Fortress 2 and Portal. Played them quite a lot and got a lot of fun out of both.

Also liked Portal 2 but not as much.

Half Life series didn't really do anything for me. They're not bad games but, very 'ok, moving on' games. When I think of great single-player FPS games; shooters like D00M and Bioshock come to mind. Even the rebooted Shadow Warrior I vastly prefer.

Counter Strike Source because it was the first Valve game I played and the MP is still better than any COD ever made.

Half-Life 2, followed pretty closely by Portal 2.

Both are masterpieces to me.

@cub:

Left 4 Dead 2.

It had everything I loved Half Life 2 and Left 4 Dead 1 for. It was Valve's perfect masterpiece.

Half-Life, Half-Life 2, Portal, Portal 2. Can't pick one... Also counter strike I can't even say how many hours I played CS/CS Source.