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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Most games should be a trilogy at most IMO after that they're milking it. Hopefully Gears 4 is good then it could have a nice legacy.