It's in the title! What's your favorite? What makes it your favorite? Gameplay, story, Multiplayer?
I love the Dishonored and Bioshock series. I think they were total package games. They were fun, great stories, just the right length, great DLC.
I'd love to hear yours!
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Shit I have quite a few... TEKKEN Soul Calibur Warcraft The Witcher Shadowrun Dawn of War Civilisation XCOM Timesplitters Metal Gear There would be a few more, but I don't really count 2 games as a series.