For me it’s when authors clearly pay attention to detail.
Having characters framed perfectly on the screen, using zooms and careful spot directing to get around animation limits (like zooming in to a character to allow them to have the full range of animations when they’re supposed to be sitting), having background characters in motion with different animations, making sure characters are walking at a normal speed and not just rushing across the screen, etc.
I try really hard to do all of these things because in my opinion it really adds to a story!