-POW gives everybody the opportunity to get in on a coin through mining. POS on the other hand favours early adopters. People who come late to the show have a serious disadvantage.
POW gives the value to the electric companies.
With the current setup, like BTC or LTC, some 95+% of the coin reward goes to electric companies and hardware companies.
So it favors some companies and the rest get their pockets emptied.