No two nacho fans are alike, and thus their taste in nacho’s very. Some prefer the original nachos, others prefer soggy chips doused in liquid cheese, and others prefer mounds of ingrediants that compliment the basic structure.  The original nacho, as invented by Ignacio Anaya in 1943 at a local eatery in Piedras Negras Mexico, are tortilla chips covered in melted chedder cheese and pickled Jalapenos.

Wikipedia Entry

If you are a purist, this is the only way to make nachos, and they are tasty indeed. I however love to experience new things, and Find that I enjoy all nachos, but more complicated nachos often tantilize my imagination more. To help understand my ratings scale, this is what I consider my perfect nacho:
Tortilla chips covered in a spicey red meat (Buffalo and Beef are best). This is then covered in a conservative layer of beans (preferably black beans) and then covered in melted shredded (not liquid) cheese blends. This is then covered in Green Chilie, Guacamole, Sour Cream, and tomatoes.
I don’t always want my Nachos this way, but I usually do.