Come again? Sure, it was 4-5 MPH down on top speed at most circuits, but we all know that time is made up in the corners and under braking. Other than that, I'm struggling to think of anything remotely resembling a "flaw".
Yeah, that "Advanced Rubber Construction 401" class that Pirelli offers at their factory really paid dividends.
Beyond the DRS not being designed to facilitate overtaking, and a front wing that was less tolerant than most of dirty air (remember the incident with Button at Spa in 2010?), the Renault lump is known to be down on the order of 15 BHP to Merc and Ferrari power. It also is known the RB7's CURSE was inoperative roughly half the time during races. Another deficit of, intermittently, as much as 60 BHP. What isn't known outside the RBR camp is how powerful it was (or wasn't) when fully functional. The rumour that Red Bull only were running a "mini-CURSE" was circulating before Bahr ...I mean Melbourne.
Vettel was the only top-tier driver who participated in Pirelli's (2012 season) tyre testing after the 2011 race at Abu Dhabi, investing two track days in boning up on the new tyres months before AlHamButtMacher ever touched one to tarmac (and before commencing his celebration of his new-won WDC). He was the only driver who visited the factory in Milan. As important as any pure knowledge he might have learnt there was the rapport he no doubt was establishing with the Pirelli staff. Which was especially evident in Spa, where Vettel struggled on Friday in FP1&2. Then he had an audience with the Pirelli boffins Friday eve and FP3 Saturday am saw Vettel back at the top of the timing sheet.
"I think sometimes people underestimate all those little details. When you add them up, they probably do make the difference for some drivers. We were impressed when he came to see us, and I think it gave us a little insight into what he is like as a driver. What he did with us, he clearly does that in all areas that he operates in. The only other driver that asks us a lot of questions is another German – who is a bit older with quite a few more championships under his belt. We found that interesting. It is like seeing the master and the protege at work.
"He came to our engineers to speak to them [at Spa]. He was trying to explain what he was feeling, and getting feedback from us on what we thought was going on. And as you know, they worked overnight to try and put things right, and the result was very clear to see. He has that intensity of focus and dedication that drives him to want to understand more, even though he will get exactly the same tyres as everyone else..."
"...Whenever you work with the best, there is always a lot to do with the level of detail. At Pirelli we've had the privilege of working with Sebastien Loeb and other rallying greats, and these guys don't sleep at night thinking about how to improve things.
"Vettel has picked that approach up from someone, or he was born like that. There could be a temptation from people when they get to F1 to think that they have made it, but the reality is he hasn't stopped – and he probably will not be happy until he has got seven titles under his belt, like the master…"
-- Paul Hembery, Pirelli Director of Motorsport