Looking at your examples it seems Lewis has to do an awful lot more to do than anybody else to pass your test. I get the impression even if Lewis beats Nico convincingly, it'll still be very much open for criticism.
Well the more you are rated the higher the expectations. Although Lewis has more to lose you also have to see that he has the chance to gain a lot.
A few thing that could be positives for Lewis
1 - He was accused of not being complete driver until he moves to a midfield team - Check!
2 - He was accused of not being to win unless the car - if he wins races then he looks better than Schumacher who could not do it for 3 years in MGP
3 - He has a chance to show how good he really is a midfield team car
4 - McLaren not challenging Ferrari and RB for pole would show what McLaren are missing
5 - If McLaren are doing well but not leading there would always be 'What if Lewis was at McLaren'
So it's not all that bad Lewis just needs to do a 2009. We saw what he did in that dog of McLaren, he can do the same in Merc and just like Alonso got a lot of respect in Renualt during his wilderness years.