The Local Group is what's known as a galaxy group, with a few dozen galaxies, in contrast to larger galaxy clusters with hundreds or thousands of galaxies. So yes, it's sparse compared to the giant clusters, but not exceptionally sparse. The more massive clusters are much rarer than the small groups.

https://www.mpe.mpg.de/2040034/clusters_and_groups_of_galaxies

What seem particularly rare are isolated "void galaxies", but there are a few known. https://esahubble.org/images/potw1545a/