Those users are leaving, sir!
Indeed. The problem that I have with slashdot beta is that there is nothing in it for me. I don't see anything that is an improvement for me as a technical user. And if I missed something, there hasn't been much of an effort to inform me.
Here's what I want:
(0) Minimal frills - function over form
dense information presentation - don't waste screen space
don't try to get clever with the UI - KISS
(1) Easy to browse new stories
(2) Fast and easy to read comments
(3) Easy to comment
(4) Easy to search old stories and comments
I don't care about mobile - who reads slashdot on their phone? We read it at the office to kill time during things like a build.