I usually approach this problem with a hybrid neighborhood definition. An immediate, contiguous neighborhood, and a neighborhood that is based on the idea of nearby non-contiguous areas that compete in the same market for the same buyers as the subject. I usually refer to it as the "extended marketing area".
"The subjects immediate neighborhood is the 5 acre horse properties on the north side of town. However, properties with similar utility, price, and appeal also exist on the south side of town. Properties in both these areas compete on a equal basis. Comparabies are drawn from both the subject's immediate neighborhood, and the extended marketing area of properties on the south side of town. "
For a review I'd mention that they were fishing off a different dock and didn't provide their basis for doing so. If that was a reasonable choice, I'd leave it at that. If it was a bad choice, I'd hang them out to dry.