Cheers for the civil response.
You're bringing politics into it. In that light, I have no choice but to agree. If music is the United Nations, then Bob Marley would be Dag f***ing Hammarskjold.
My objection is narrower than that: I find his music unlistenable. It's a matter of taste. I admire the politics of The Clash, for instance, but I wouldn't give a toss if they hadn't put out a clutch of amazing records.
If Marley brought the plight of Jamaicans to the world then he deserves my respect. I just think he and his band were, well, shitty.
And I'm not really comparing Marley to Jefferson Airplane-- again, they have one characteristic, the one I mentioned. If the question were, "The Ten Worst American Titbags" then Marley certainly would not (of course, could not) have been on the same list. But the post asked us to list the ten shittiest bands ever.
By that criterion, Marley certainly makes the cut-- unimaginative, repetitive ditties that all sound utterly alike to my ears. His musical legacy is a sacred cow that ought to be put under the knife. It won't be, but that's what remote corners of the Internet like this one are for.