The plane I looked at has hail damage but the dents are rather small. If I were to get over the cosmetic issue, are there other concerns I should consider?
No. In fact the dimples give the plane more lift, like those on a golf ball.

All kidding aside, the small dimples don't affect the way the plane flies, but you can use them as a bargaining point to bring down the price.
My plane used to be owned by a flight school and parked outside. It has small dimples all over the top surfaces. It flies just fine.