Williams in 06 was probably the most unrealible car i have seen do a season in the past 10 years.
It did have some pace on it though which was suprising since they were using the no frills Cosworth engines.
But yeah with McLaren and Williams it was all about who was funding them on how good they were, Ferrari are lucky in that sence as they made there own engines and have a huge financal backing from Fiat.
I have no doubt in my mind that if Mercedes withdrawed from Mclaren, Mclaren would go to shit, but if these new cost cutting rules come to play that could be stopped.