Obvious really, but the original Halo. It was probably the biggest reason why the market is flooded with shooters now.
The only other games that really stand out off the top of my head is probably Starcraft, since it made RTS a big deal. WoW as well, since it's what made MMORPGs popular in a big sense. And for the final candidate, Portal of course. You don't even need to say why if you've at least watched the teaser.
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