I have never heard a single bad thing concerning an Alaskan cruise.
The excursions are heavily weather-dependent and it rains
a lot. We were exceptionally lucky with two rain days (sea day from Seattle, Juneau) followed by four sparkling, sunny, perfect days (Skagway, Glacier Bay, Ketchikan, sea day to Victoria).
Even for somebody somewhat settled in now to the awe of the West, Alaska has another gear. The skies, mountains, glaciers, forests, seas are beyond my ability to describe. Your are in a penumbra of the world, where the taken-for-granted comfort of our connection to nature is eclipsed by size, remoteness, and throughout all silence. Like Monument Valley in New Mexico, the Alaska I experienced, even the just the tip of a cruise sojourn with a thousand other looky loos, holds a quiet I waited my life to hear.
When I stare out into space with a telescope and feel the finality of the distance, coldness, harshness -- that is what I felt just being there. When you stare into beauty, beauty stares into you.