In summary, anything on-board the actual cruise (and tours) were excellent but the "corporate" side of Viking was not.
First the good (read that as the ship-board and tour part of our cruise experience):
The itinerary, the ship, the cabin, the food, and particularly our Cruise Director (Marek Snelly) were wonderful. The land tours were well-organized and thorough. The first 3 nights of dinners were fabulous and then just very good thereafter.
Scandinavian styling at its best. Not a big cabin but incredibly well-designed. "Soft" closing closet doors with automatic lighting. Soft closing bathroom sliding door. Under cabinet floor string lighting in the bathroom so you can see where to go in the middle of the night. Every inch of it efficiently used. Under-decorated elegance.
The shower was trapezoidal, with a shower wand, and clear shower doors (not a curtain). Very nice.
The cabin steward serviced the room seamlessly and seemlingly invisibly. We'd go to breakfast and even if it was only for a few minutes the cabin had been serviced.
And there was an ice dispenser just a few feet down from our cabin. No noise and so convenient. And NO room service tip either!