It's gone downhill. Scrollbars that only appear half the times you need them, buttons that aren't buttons, not-buttons that are in fact buttons, instead of curated menus Evince has three places you can click and hope to find the function you want in one of them, it's just a mess.
Win 95 had the basic UX down, and Tiger made it look very pretty, but it didn't need any more fixing.
Windows 95 brought us those god-awful cascading menus that would disappear the second you missed a hover target by a single pixel. I for one am glad those died out.
I don't understand how anyone could say that mess was good.
I think this is due to the operating system being replaced by a combination of (1) the web browser; and (2) Steam. Nobody cares what the OS itself is doing, because they aren't using it.
Win 95 had the basic UX down, and Tiger made it look very pretty, but it didn't need any more fixing.