Of course with this being a first person shooter game, the most important aspects are the weapons. Anyone who has played Left 4 Dead 2 demo can agree that the introduction of new weapons have made the game more interesting
Nintendo Wii has revolutionized the gaming industry because the players are not just sitting on a couch or a chair clicking buttons or moving arrows. Based on this, how many Wii have been sold is a direct correlation to the popularity of this gaming technology.
This article gives a quick explanation of the five different phases of Spore for PC.