People doubted Karpov when he recieved the title in 1975
The 2012 World Championship of Chess!
People doubted Karpov because he won the title by default when Fischer refused to play. Nonetheless, Karpov's play was consistently of a very high standard, with precision and technique of a world champion.

"well every champ goes through a downward spiral eventually (due to age).though in anands case I think it's more due to disinterest than age"
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"CerebralAssassin", although I agree with your assessment of the ineviable downward slope of the performance curve...in Anand's case, a host of commentators have also speculated as to the "why". The fact is that there are too many factors that can be the cause. I find it interesting that everyone says motivation or disinterest, but no one has even considered health or other personal stresses which may be affecting Anand. I think we may never really know, unless he chooses to reveal same at some point in the future.
yes...it's pure speculation...I don't know for sure....he became a father recently so maybe that has to do with it.