From the PlanetXbox360.com feature article:
"Sequels are what gamers of all walks look forward to after finishing an original. But, while getting the same thing can be good, pending there’s been even a chunky slurry of improvements to the meaty whole of the gameplay sometimes we end up getting nothing more than a rotting carcass of disappointment. It may not necessarily be the sequels fault, occasionally the shoes are just too big for the next game to live up to the expectations of the fans – while it rarely is just a case that the game is another in a string of titles from a milked franchise waiting to die. It could be a whole slew of reasons. Nevertheless, the ten who made our list are without a doubt offenders who definitely couldn’t stand in the shadow of their predecessors without being found wanting."