Like a pebble that has been rounded over the centuries by the gentle splashing of the ocean waves, Halo 3 has become the perfect hardcore first-person combat simulator. By dint of painstaking labor on the part of its developer, Bungie, it has been refined over three installments to the point where it delivers only pure, unadulterated gaming bliss. With 5 out of 10 games on this list being first-person shooters it's safe to say that this genre dominated video games of 2007.