Kevin Nash? He was a main eventer in WWE before the Power Plant even opened.Most of the WCW power plant products have been successful to an extent in spite of them being taken from the same template and uni-dimensional. A list of WCW power plant trainees below:
Shane o Helms
Ernest Miller (though he found success after becoming the Cat)
Would call WCW power plant a successful training school or failure for dishing out similar products which was in demand at that time.
Seriously, stop quoting Wikipedia.