Talent in one area doesn't translate to the same level of talent in other areas. For instance, Nobel Prize-winner Linus Pauling, called "one of the 20 greatest scientists of all time" by New Scientist, promoted high-dose vitamin C as a cancer treatment long after it had been discredited (https://en.wikipedia.org/wiki/Linus_Pauling#Medical_research...).
Also, IIRC, Chomsky's contributions to linguistics are somewhat controversial, and I've read that his lock on the field may have set it back by decades.
The vitamin C episode is also covered in the same book :)
Also agree the point on talent in general.
In this specific case though I get the impression Chomsky is more highly regarded than most political scientists.
GP comment set the bar rather low by associating criticism of mainstream media with randoms on facebook. Regardless of whether you agree with him I think Chomsky safely exceeds that bar.