MR may have opted for excessive emphasis on liberation via the 3rd World, or maybe not. But that political analysis is but one aspect of the MR tradition -- the lesser one, I'd say. If you haven't read Baran's _Political Economy of Growth_, Baran and Sweezy's _Monopoly Capital_, Braverman's _Labor and Monopoly Capital_, and John Bellamy Foster's environmental work, you are truly ignorant of what MR stands for and has achieved.
I know of no other left entity, other than Chomsky, that comes within a mile of rivaling the MR contribution to explaining the working of capitalism, both at the top and the bottom of the system.