The first time, I saw his opinions re USA's/NATO's intervention in ex-Yugoslavia. It just seemed like conspiracy theories, especially when I googled and found his apologetics for the Khmer Rouge (before they were found to be massmurding crazies).
The second time, I got a link to a Chomsky interview. I got shocked -- Chomsky claimed that he didn't talk about the Sudan atrocities, because he couldn't influence much. WTF?! If the most famous academic US-critic, beloved by dictators, publicly condemned the Darfur handling etc by Sudan's government as 1000 times worse than what he complained about Israel, it would have an effect...
I wrote Chomsky off as another effect of the US right/left being equally crazy. Here in Europe we mostly get the left crazies, so he is big. Maybe I'm wrong. Maybe. It seems to me Chomsky argues by (correctly) noting that governments lie a lot -- then he comes with really weird explanations to what really happens.