Okay...

I admire what has been done though I disagree with some of the methodology. Some races, where a driver very obviously had a problem, but is "classified", are still counted? While some accident, where said driver was responsible or partly responsible, are not counted for score?

Other than that... quite obviously Massa had worse reliability than Hamilton in 2008, so that's where he lost out. Especially if we include the Singapore pitstop as a "reliability" problem as well. Pit light signaling system reliability or whatever it was.

2003 is very complicated to work out. Montoya had a couple of car failures from the front (Austria, Japan), Räikkönen retired in Europe from the lead, but also Schumi lost chunks of points due to puncture in Germany.

If I am not mistaken, "reliability-corrected" 2012 should see Hamilton right up there near the front. He retired from the lead with car failures on multiple occasions.

1991 is interesting. Mansell definitely retired a few times, though I am still unsure whether the Canada incident was his fault or car fault. Arguably he lost attention on the final lap, waved to the crowd and pushed the wrong button. But is it myth or not? Because based on that depends if we can "give" this race to him or not.