What's the best FPS series of all time in your opinion?

[SvennoJ]

newwil7l said:
Halo. Like others have said it really revoloutionized the FPS genre. It also has a kick ass storyline unmatched by any other FPS.

I think you mean popularized on consoles instead of revolutionized.
Compare Half-Life to what came before it (Doom/Quake clones) to what came before Halo.