Cole something can be totally delicious and totally disgusting at one and the same time. Being delicious is about a combination of taste, smell and texture. In a well made haggis these three things come together. Haggis has one of the most intense Umami taste experiences available in traditional European food.
Being disgusting is about our perception of certain food products, generally brought about by modern advertising. Most people today refuse to eat offal which I think is a major failure on their part. They are allowing a large proportion of an animal that has been killed for its meat to be discarded. Actually they are generally not discarded but get hidden in mass produced foods where you do not expect them, like sausages. That something is disgusting is very much based on your social conditioning.
Fortunately there are now signs that foodie culture is now moving back into using offal - which has traditionally been a main element of the common peoples diet.- and there are some exciting dishes being served in some of the top European restaurants.
A food product which was quite common in the part of England where I live is Faggots, a product which is made from products very similar to the Haggis, except that Faggots are made from pig parts rather than sheep's parts. There is a local Michaeline starred establishment which servers Faggots as part of its menu. Like Haggis they are, if properly made, totally delicious.