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I got bored. No ranking system. No care to win. No incentive. Maps are terrible, besides Haven. Been playing since Halo 2, staying up late with friends, gambling with the chance of trying to achieve a higher rank in slayer and doubles.
In 2007, Halo 3 had more people playing than COD4.
Now, Call of Duty has passed Halo.
Same progression system. COD has better maps, better customization, game types. Nothing unique about Halo. The 1-50 is what made Halo unique and gave it incentive. Without it, you have what we saw happen to Reach.