How does the Berserker's slide work?

What do you mean?
It does both damage - and moves the enemy behind you as you pass through.

That's true, sometimes it just does not do anything. Initially I thought it was nerfed in such a way that it only damages/trips enemies when they're running toward you (which seems to be te case most of the time when the slide actually works), but it's too inconsistent still.

I will look into it.

This seems kind of fixed now. :)

... emphasis on kind of, maybe I just got lucky with the slides

yeah, still no change, my bad