Nintendo
-Would not have any laws that might offend anyone. Criminals would be taught family values rather than be convicted.
Sony
-Would start out by removing several sewage treatment plants since they have a strong belief that their s### doesn't stink. They could do no wrong, since no matter what they did, their army of fanboys would defend them to the death.
Microsoft
-Start out by buying out the other canidates. Everyone would live in a house that includes a grocery store, gas station, mall, department store, bank, and place of employment so you would never have to technically leave your house. However, the jackass next door to you could just walk in and steal anything they wanted since the design failed to include glass in the windows, and the doorjam included a lock, but no door.
Sega
-Would innovate the way for a new and better design for the world than Nintendo and Sony, but would soon fail because they forgot to tell anyone about it. Then Nintendo and Sony would suceed by having less of an idea of a better world, but they had better campaign ideas.
Electronic Arts
-EA will just gripe about the other canidates and speak loudly about how inferior they are, then ride on the coat-tails of the underdog. Then proceed to speak in volumes on how great the other canidate is, and how happy they are to support them.