So he is a nutty leftist, just not a nutty far-leftist?
Basically. When you know actual French far-leftists, you can easily see the difference.
Yes but France is several notches to the left of almost every other developed western nation with the exception of the Scandinavian states. Although the difference is their political discourse seems competent, whereas in France it seems like half of their politicians are still stuck in the 1790's. Melenchon would be considered a far-leftist outside of France. Even the BBC, a bastion of liberal-leftism, calls him a far-leftist, as to other such bastions like the Guardian.
By that logic dailymail is a center newspaper?
Nope. It is very right-wing. But then the Guardian is incredibly left-wing. As for the 'Independent'. The title makes me want to laugh.
The problem is that your classifying BBC as a left-wing paper, that's like saying CNN is left-wing.