Franchises can't exactly get ruined for me, but some of these came close.
Crash Bandicoot: The wrath of Cortex
Spyro: Enter the dragonfly
Age of Empires Online
Romance of the three kingdoms XII
Dynasty Warriors 6
GTA IV
FFXIII
World of Warcraft Cataclysm and everything after
Cod after Black Ops
Digimon World 4
and many others...