Yes! When using an AeroPress, there is such a thing as a "just right" grind — not too fine and not too course.
The ideal AeroPress grind setting is a medium-fine grind, between drip and espresso.
As a visual reference, try to grind a few beans at a time until they resemble the texture of table salt.
The only way to render a delicious cup with an AeroPress is by grinding it yourself with a burr grinder.
Unrelated to grinding but essential for a great cup: AeroPress highlights acidity in coffee so a medium-dark roast will give you the best result.