The following I would say are years in which the best driver over the course of the season did not win the WDC, working backwards:
2012 - Vettel (Alonso)
2008 - Hamilton (Kubica)
1998 - Hakkinen (Schumacher)
1997 - Villeneuve (Schumacher)
1996 - Hill (Shumacher)
1993 - Prost (Senna)
1989 - Prost (Senna)
1988 - Senna (Prost)
1987 - Piquet (Mansell/Prost)
1982 - Rosberg (Pironi)
1981 - Piquet (Villeneuve)
1976 - Hunt (Lauda)
1967 - Hulme (Clark)
1966 - Brabham (Clark)
1961 - Hill (Moss)
1959 - Brabham (Moss)
1958 - Hawthorn (Moss)
But that would be to do a disservice to the men who did win those championships. There may be one or two duds in the list, but I don't think many people begrudge drivers like Hunt or D. Hill their world titles, although I wouldn't name any single season in which they were the outstanding driver. I'd also say that the seasons delivered by Vettel in 2012 and Hakkinen in 1998 were worthy of world championships, even though neither scaled the heights of whoever Ferrari's resident genius was that particular year. Hell, you could even argue that Frentzen outperformed Hakkinen in 1999, but I'd still say Hakkinen was one of the 20-odd best drivers F1 has ever seen and a totally deserving double world champion.
A victory for Rosberg, though, would grate. The only circumstances in which I think he could be a worthy winner is if Hamilton chucks it off the road in the final two rounds. Otherwise he'll either be the beneficiary of good luck (fair enough, mechanical failures are part of the game after all) or a ridiculous points system. And that really would suck. I suspect I'm going to sit down for the Abu Dhabi GP and, for the first time in my life, pray that Hamilton succeeds.
EDIT: It's also sometimes the case, as in 1996 and 1981, that the best driver that particular year isn't in the title hunt at all. I don't think that necessarily undermines the title fight or the drivers contesting it; after all, it's a helluva lot harder to perform when the pressure's on.
Edited by Spillage, 05 November 2014 - 22:55.