You do get knowledgeable posts on Slashdot. But there is a lot of noise and a lot of snideness. You still get posts implying Smalltalk is slow, though it's actually one of the faster pure-OO languages at this point, and one of the commercial implementations (VisualWorks) has an unbelievably good implementation of generational GC. (Seriously, I put an infinite background loop that just allocated memory into the petro trading client I was maintaining, and it was hard to notice!)

A lot of the population there doesn't have a CS degree, and hasn't bothered to give themselves an equivalent education by reading, and so find basic stuff like the "Sources of Disk Latency" to be "Interesting" and "Informative." But the site works for real signal, because eventually some expert is pissed off enough to post a page long in-depth spiel.