I grew up in a large neighborhood with an HOA. There were a few times where my family butted heads with the HOA (replacing fences with a non-standard style, a play swing/slide thing being a bit tall) but for the most part the HOA was nice. They managed a park and pool for the neighborhood's exclusive use. They decorated the entrance signs to the neighborhood for the holidays. They put on some holiday events like an easter egg hunt/picnic, a fourth of july bike parade, Christmas light judging/awards. People didn't have tons of clutter in their front yards, the streets weren't super crowded with cars.