In what way does it look bad? Historically, digital-focus fonts have been drawn specifically to handle very lo res displays, or very small print applications (optical embellishment, ink traps, etc)… but given that type designers are notoriously detail oriented and that font files are collections of vectors, I can’t see a reason why the design would lead to these effects. Ironically (since this is a Microsoft post) Windows often mangles type display, so can browser settings and CSS defaults/resets.