IMHO, it is all down to the location. It's all about where you are and what is at the aerial end of the ILS that counts. For example, McCarran in the USA is a good ILS, as Las Vegas is at the end. Hickam AFB is good, as Hawaii is what awaits. Not so good ones include Kinloss and Lajes. In the poor category, you have Al Kharj and Goose Bay. The worst ILS in the world though must be at Mount Pleasant Airport in the Falklands.
Does that answer it?