The thing is Lambert got given far too much time (given his returns and his football) and most people would have said Sherwood was no long term answer. It's the end result of bad decision making overall - remember, McLeish and Houllier were the two managers before that, both obviously awful appointments from day one for different reasons - rather than just relentless sackings that has led them here. Their summer business will probably be what buries them, trusting Jordan Ayew, Rudy Gestede and a finished Gabby Agbonlahor to deliver the goods at that level would have been like us playing Keogh, Maierhofer and Iwelumo as our only strikers in 09/10. And apologies to Andy Keogh there, that's a harsh comparison on him, Ayew the Lesser is terrible.
