Agree with Stig. i think Hamilton's mercedes championships are so severely diminished by being in the V6 era I will never actually consider him much of a multiple world champion.
Then I guess Vettel wasn't much of a champion, having won all his titles during the extreme aero era? And Schumacher, not much of a champion because he always had a number two who's job was to help Schumacher to a win, but never win himself? The fact is that whatever we think of them, those drivers won those championships when others could not, even when the rules are the same for everyone.