I think that Moore's representation of the working class is often based on the idea that 'authentic' working people are 'innocent' and 'ignorant' of politics (unlike Moore himself and those 'leftists' Moore loves to criticize). I think that this mode of representation is a problem.
On the other hand, I love his satire of the upper class arrogance. Artists on the left should do much more in this vein.
Yoshie