Well, if it's cooked poorly, it's a gelatinous off-tasting mess. If it's cooked right, that is with enough salt and heat to absorb the excess moisture, it's relatively firm and quite delicious.
I've been told that since I'm mostly vegetarian (I eat some fish), I cannot possibly eat lutefisk:
https://youtu.be/E7X6Z_SV-Pc
Luckily, no one in Norway has tried to make it for me yet and my Norwegian spouse says if I try to cook it, he's going to be out of the house a few days. I guess the smell is quite... special.