We looked into Hurtigruten and compared it to cruises by NCL and Royal Caribbean.
Hurtiguten has some advantages and disadvantages compared to main stream cruise lines.
Hurtiguten is more expensive. Comparing Hurtiguten cabin with NO balcony is more expensive than a cruise ship with NCL or Royal with a balcony.
Hurtiguten visits way more ports, but many ports the ship only stay a few minutes, so you don't have much time to tour. They offer excursions for a few ports, but not as many as the main cruise lines.
There is a lot of great entertainment on the main cruise ships, little on H.
There are many more options for dining with the main cruise ships than on H.
Also, I am not totally sure on this, but alcohol on H is very expensive. You can get a beverage package on the main lines, or a low cost wine package if you drink wine.