I seriously believe that someone is trying to sabotage Slashdot by making it decreasingly pleasant.
Exhibit A: the new-and-busted discussion system. I actually like it more than the old way for reading comments, but for writing comments it's almost maliciously bad. The new system's preview button is much slower than the old way, and the mandatory waiting time between posting comments is a lot longer than it used to be. The net result is that whenever you're eventually allowed to click the "Submit" button, if your comment doesn't go through immediately, you're stuck staring at a pink error message until the countdown is finished. The only thing keeping this tolerable is that you can middle-click on "Reply to This" to open the old-style comment form in a new window, but I don't know if this workaround is going to be left in place long-term.
Exhibit B: Idle. This is truly the worst interface I've ever seen on Slashdot, from the painful color scheme to the tiny fonts to the difference between the markup used in comments between Idle and the rest of Slashdot. For example, the <quote> tags are treated like <p> in Idle, so there's no visible difference between text you're quoting and your own words. I don't even mind the content so much because it can be an amusing diversion, but wow, the implementation is just terrible.
No, I contend that the new changes are deliberately designed to drive away readership. I don't think that the Slashdot admins are incompetent, so I'm convinced that this is on purpose.