Dead space.
In my honest opinion, CoD 4 and The Darkness were two of the best single player campaigns I have ever played.
HL2 better be one >:o
Actually, no. While HL2 has a good storyline (that I love of course), CoD 4 and The Darkness presented it in a very cinematic fashion, which felt more immersive. At the part when you watch Jenny die, it was a really sad moment, much like in I Am Legend when he has to kill his dog.
Pikmin. Who knew gardening could be so much fun?
Forgot to add why it amazes me. When it first came out, it wasn't too anticipated, nobody knew what to expect. You start it up, pick your first pikmin, and instantly you are hooked. Same with Pikman 2. My friend and I stayed up all night taking turns in singleplayer.
But Pikmin 2 is multiplayer...