I find Chomsky's critiques of US Imperialism to be fairly dry, lucid and unemotional. However, it is difficult to perform a critique of America's moral standing and not be accused of having a slant, regardless of the sufficiency of your evidence or the strength of your argument.
He's a guy you can't watch with your blinders on, but the raw amount of material there is, and the coverage of events like Iran in 53, Chile in 73 is a good counterpoint to anyone who wants to suggest the US cares particularly about democracy, or has only been a force for good, that kind of rhetoric.
Is there something similar that has less of a slant?