Of course he's worthy enough to be a 3 times WDC. Going by the logic of the OP, one must be inclined to think that a driver worthy enough to win a World Championship must do so in an inferior car. Why? The car and driver are part and parcel of the entire package. Jim Clark won many a race by more than 20 seconds ahead of his nearest rival, yet few, if any, would call his victories hollow. The same could be said for Fangio, Stewart, Prost, Senna, Schumacher etc., etc. Would people call their victories hollow? Some may say he's been lucky. Well, luck whether we like it or not will always play a part to some degree and it should be remembered that for a driver to be in position to clinch the WDC he must be in position in some way or another throughout the entire season to capitalize on others' mistakes and/or misfortunes in order to seize on that. Worthy? Yes, absolutely.
What makes a driver deserving of a WDC?
Just going by the BBC list, the majority of the 3x WDC drivers had the option of either a spare car or hopping into their teammates car. Plus the majority of the time they had the best car in the first place.
This thread is about if and a big if, Seb winning his 3rd WDC.
If you look at how other drivers have acheived a triple WDC, does that devalue what Seb has done? Especially in the nature he has one it and with the competition against him.
When was the last time a driver won his 3rd WDC without being in the best and most reliable car, without a t-car or in fact not being able to jump into their own teammates car if it suited them better?
This thread, rightly or wrongly has become a driver vs driver thread.
However the title of the thread is "Is Vettel worthy of the 3 WDC Title?"