Final Fantasy is a close second, and the only reason I chose Zelda over it is because FF isnt really a series, so much as it is a bunch of different RPGs with similar systems bearing the same name, while Zelda is a true series.wrap your mind around that
Halo because of A) Freakin awesome hero. B) Even cooler sorta hero (The Arbiter i mean). C) Great story. and D) fun gameplay and Multiplayer