Release too many sequels

Keeping up with Activision's Guitar Hero franchise is like subscribing to a magazine; a new one arrives every month. The company took a wonderful thing and watered it down by releasing cell phone games, DS versions and special band-themed Guitar Heroe games. We can't blame Activision for milking a mega-popular franchise, the world has become oversaturated with unused plastic instruments and unsold copies of Guitar Hero Aerosmith that continue to infect store shelves. Releasing Gears of War 2 a couple years after the prequel was a smart idea. Pumping out sequels and spin-offs every few weeks, however, is over the top.

Other offenders: Madden NFL Football, Rock Band (with LEGO Rock Band)