Why wouldn't you want the circuits in your home to be series circuits?

In series, each device creates a voltage drop related to the current and impedence of the device, therefore, the voltage for the devices in the circuit are not the same.

Addition:

Also, in a series circuit, if one device fails, all others in the circuit would also "turn off" - think older strands of Christmas lights.

Lets say for example that all the lights in your house were in a series circuit. When you turned the circuit on, all the lights would come on, but when you turn the switch off, all the lights would also go off (possibly useful when leaving for the day or going to bed). Now, one light bulb blows out...every light in the house would go out, leaving you to try replacing every light in the house until you found the correct one...in the dark.