If [...] Vettel is really as awful as you’re saying
I don't think he's awful at all, I think he's quite good, and certainly better than some others on the grid. But I do think he's over-rated, and the four titles flatter him, as he's not been able to replicate that form without a supremely dominant car. My use of the word 'awful' was just a way to question whether number of overtakes is necessarily a good measure of ability, a hypothetical example of a driver in a good car who is bad at qualifying.
I would say over half of every championship Hamilton won was with a dominant car as well, is that making him an "awful" driver? Vettel won 4 times in a row, that alone is great, not a lot of people have done it as talked about before, even with a dominant car. Hamilton has 7 championships and 6 of them were with cars so dominating that it was not even close, by your logic Hamilton sucks big time.
Also how could overtaking doesn't say too much? These are the people who are actually world champions and racing very cleverly and they know how to overtake others because newbies are not that great at it, how could you say that in a race sport, overtaking doesn't say much? Alonso is great, Vettel is great as well, Kimi was great too, they just had amazingly horrible cars. Give Vettel and Alonso Mercedes cars next year and I guarantee you, one one of them will be the champions.