People seem to forget with F1 that the car is THE difference. The only true way you would ever find who is the fastest driver would be if the FIA went to one manufacturer and said this is the specs for the engine, chassis, aerodynamics etc. Build 24 identical cars and we mean identical. That is the only way you would ever have an even playing field but it will never happen and nor would I want it to.
Look at the McLaren vs RedBull. McLaren has far better mechanical grip so does better accelerating away from slow corners. However get on a track with a few medium to high speed corners and the RedBull (which has superior aero than anything on the track let alone the McLaren) just storms away.
Part of the attraction of F1 is seeing how the teams can build and manipulate a car to try and give their driver the edge over the others. RedBull have got Adrian Newey, who is a modern day Colin Chapman, and he can interpret the regulations ether than any other team to give Vettel the edge.
I don't dispute that Vettel is talented. He has to be to produce the results. It's just that his team have given him a better set of tools to use than anyone else.