The reason no one recalls any races where Vettel has really had to fight for victory when he's been behind is because they don't exist. All but two of Vettel's victory come from pole position, where he has lead going into T1, and gone on to coast to victory. The only races this wasn't the case was Abu Dhabi in 2009, where Lewis got pole but had brake problems in the race and eventually retired, and Barcelona this year, when Alonso jumped him at the start. When he has had to fight from further back, or in slightly inferior equipment, to say he has fallen flat on his face would be harsh, however he has not shown to be great, clumsy would sum it up quite well I think. Similar in that respect, to Felipe Massa. This season he hasn't put himself in a position where he has had to fight from further back than the first row, so we can't criticise him for that, however as you say.... he is very much unproven.