There is no doubt its a tough market out there and Renault are feeling it more than most but this is in part (at least) down to model cycle, the all important C sector car, The Megane is being replaced, given that Megane series cars represent a significant portion of any Renault Dealers sales, it is no wonder they've been struggling. The new Megane is due this months with variations due from January.
That said Renault execs need sacking for some appalling decisions in recent years.