He is decent. He has been linked to Premier League clubs. Difficult to say if he is Premier League class as he has not been tested on that front, much like Zaha.
Palace benefit from being able/willing to offer first team football in a cosmopolitan city where young players will find it difficult to break into a side in the upper echelons of the football league.
They vie with Charlton, Watford and Millwall to be the best 'London' side, way behind...