By Denis Auroux

The solutions to each of the grids is as follows (sad neighbors are colored in blue; disgusted neighbors in green):

After solving each grid, count the number of sad (blue) neighbors outside of each loop, and use that as an index into the alphabet:

Neighbors Letter
8 H
15 O
23 W
7 G
18 R
5 E
1 A
20 T

Reading in order yields the answer, HOW GREAT.