depre:
I am currently running with IRFZ44N's to power 4 DC motors for a quadcopter.
The IRFZ44 is NOT a logic level mosfet, and is not really suitable to be used with the 5volt logic of an Arduino.
The mosfet could get warm, and your motors will not reach full speed.
Also, use a schottky diode across the motor, not a common 1N4004 as in most diagrams on the net.
Leo..