Halo WAS revolutionary, if you look at it as a console FPS which it was. Sure it wasn't anything new to PC gamers but there was nothing really like it on the consoles. Before I played the first Halo I think my favorite FPS on a console was Timesplitters which Halo beat in size, graphics, presentation... it was a beautifully constructed single player and multiplayer experience for a console. I remember being a beta tester for the first Killzone shortly after Halo came out, I was so excited because I thought the FPS was getting better and better on the consoles... I was wrong.
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