Oh man, the strength of the Mandalorian went down the toilet from KOTOR to the Original Trilogy...if the storm troopers are Mandalorians who easily die by blaster fire or one stroke of the lightsaber, what happened to their strength?
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The Clones in the OT were not all Jango Clones. Many of them were made up of a new clone template, or were just Galactic citizens who became Storm Troopers.
The Mandalorians during the Old Trilogy didn't have any power anymore, because they were enslaved by the Empire. Though a Mandalorian who faught in the Clone Wars would free them and make them into a pretty good size army again. Mandalorians by the time of the New Jedi Order are already on their way back to kick ass status.
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That makes sense.