On my computer, with smooth line display enabled, the lines look slightly out of focus. Yes, curved and angled lines are smoother but they are not crisp; it's like a slightly soft focus on a camera.
Is that the way it's supposed to look? Is it my computer or some setting in AutoCAD?
I only see the soft focus in print previews. In Paper and Model spaces lines look as crisp as ever, with curved objects displayed a bit better.
You can try to set LINEFADING to OFF to see if that helps at all.
If SELECTIONEFFECT is set to the new default 1 (blue), the selected items look fuzzier to me. With SELECTIONEFFECT set to the old 0 (dashed), that goes away. (Do note that at least some people are experiencing reduced performance when selecting objects with SELECTIONEFFECT set to 0).
I think I got caught up on semantics. Lines are as crisp as ever, but arcs and circles do have a sort of soft focus with LINESMOOTHING set to ON. I think that's just the nature of smoothing out the curved segments.
I think it's normal to see a bit of fuzziness if you choose not to see the jaggies.