Barozi on 24 November 2012
It's a pioneer of several elements of FPS (just like the first Half-Life).
storytelling, graphics, length, physics and physic based puzzles and NPC interaction.
You should definitely play Episode 1 (relation between Alex and you) and even more so Episode 2, which is much closer to the newer standards.
EDIT: I agree that it was better in 2004, but still great to play today. For comparison I only really enjoyed the first level of HL1, because the rest feelt archaic when I played it 5 years after release for the first time.
Nevertheless I know it has spawned many many ideas for games like Halo or Metroid Prime and the rest and therefore I fully respect it.
