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1.
The Call of Halo effect :

Creating an amazing game that can then allow the producers to spawn a series of shitter games and still make profit
Infinty Ward : Oh lets create call of duty 4
Childrens : OH YAY CALL OF DUTY 4 <33333333333333

Infinity Ward : now lets create World at War and MW2
People with sense : Wow, this is shit.
Childrens : OH MY GOD YAYYYYYYYYYYYYYYYYYYYYYYYYYY
-Makes lots of money anyway-

And the same for Halo, with Halo 1 being amazing, and Halo Reach being downright shit.

Behold, the call of halo effect
by Lukeg33 April 23, 2011