What This Means
The best 800-point sailing is Voyager of the Seas on a 7 Night Alaska Advenighture Cruise from Seattle, with the strongest score in the tier. The top-five list also includes a second Voyager Alaska sailing, which confirms that the region is not a one-off at this level. The cabin mix is mostly Interior - GOBO - GTY, but the itinerary quality is strong enough to make the tier usable.
At 1,200 points, Alaska becomes more comfortable. Ovation of the Seas appears with a Balcony - GOBO - GTY on a 7 Night Southbound Alaska & Hubbard Glacier cruise from Seward, which is a clear step up in cabin quality. From there, Alaska stays relevant through 1,500, 2,000, and 3,000 points, with repeated strong scores and more balcony access.
So the practical cutoff is 800 points, but the better Alaska value starts at 1,200. If you want the first tier where Alaska is genuinely on the board, 800 is enough. If you want the first tier where Alaska starts to look comfortable, use 1,200.