What are some good PC games that you know?

Hi guys, I'm having my break half and I was wondering to buy PC games. Type pls in your suggestions w / a brief description (by the way I love those hack and slash sword thingy, but anything will do as you say it's good ^ ^.)

World of Warcraft - MMORPG $ 15 per month Guild Wars - Free MMORPG Maplestory - Free 2D MMORPG Spore - Adventure / Creativity Counter Strike - FPS Combat Arms - free FPS

Starcraft II Gameplay: Psychic Assault (Beta Game Footage Video)

[affmage source="amazon" results="3"]pc games videos[/affmage]