All those places used to be great, especially 4chan. They were the worst places on the internet, and I loved them for the sake of their e-cruelty; but then they all became overly-popular and overly tame. No more do they conduct great raids, but stagnate under the growing population of underage teeny-boppers, college-age douche-bags, edgey-crowd posers, and all the aforementioned newfags who think they are exclusive members of a hip underground organization of '1337 h@xx0rz' fighting social injustice.
End of rant.
I do apologize, that was more directed towards 4chan than ebaums, but I still haven't found an internet hate-generator that will ever match 4chan pre-/b/day. Still moldering over it.
But for a frankly serious answer - All of them are kind of over-exaggerated. From a point in my rant, some of them -like 4chan, really were quite terrible places, but after a certain point (in this case /b/ day) they all started to decline and become too tame for my tastes.