The tutorial is to teach players how to play the game. It is not supposed to challenge players. Why would someone want to buy the game if they didn't believe they could learn to play it?
Microphone chat is a bigger task than it sounds, and with torque networking, it's not gonna happen.
Maps, vehicles, bricks, color sets, music, and scripts are generated by the community. The ones provided with the game are just examples. The bow is an example of how to make an automatic weapon, the gun is semiautomatic, the spear is thrown, the sword is melee, the horse ray is scripted, the jeep is a wheeled vehicle, the flying jeep and magic carpet are flying, the ball is an unusable toy, the tank has a turret, the horse is a ridable player... You see? Just examples.