Let's exclude the obvious Call of Duty, Assassins Creed or any yearly series. I'll start, Halo, Gears of War, and Forza.
Edit: Read below and find the people upset.
Edit 2: Calling me a Playstation fanboy makes you look retarded FYI
Edit 3: It has just hit me a majority of people commenting must have needed a helmet to cross the street when they were younger.
Edit 4: My Gamertag is "Ukimoi", as always stay mad people.
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Really there is no reason to end a game series that is popular. If they ended COD there would be a ton of outrage and we would possibly loose the gaming industry. If we lost Halo, then the Xbox would fail and the Playstation would soon follow because it would have no competition and reason to become better. Same thing with the most popular Playstation exclusive just vise versa.