Finely knotted or finely woven rugs are more desirable than those that are less fine. There are several reasons why that is so.
For one, curved lines in a rug’s design can be “drawn” more smoothly and gracefully in a rug with many knots per square inch, just as a lot of pixels in a television screen allow for more natural looking lines. And too, rugs that are very finely knotted have such dense surfaces that light is reflected from them in an attractive way. But it must be said that fine knotting alone does not make a rug good.
A case may even be made that a fine weave simply is not appropriate in certain kinds of tribal rugs. By and large though, if all else is equal, a finely knotted rug is more attractive than a less finely knotted rug.