I adressed that topic once (click), interestingly it seems to be the "result of constant exaggeration" kind of 'fact'.Don't be ridiculous. Red Bull was as quick as Mclaren throughout the season, and had far less reliability glitches. It was easily the best car for the entire championship year. If anything, Vettel nearly lost the title due his inconsistency throughout the season -- eg. making more mistakes than Hamilton and Alonso combined. His multiple crashes in the most critical parts of the season, Abu Dhabi and Brazil, showed that his nerves are far from being made out of steel.
and I didn't even start on red bull being just as quick as mclaren...