We’re on Majestic Princess in the South Pacific, it’s fantastic and I’m sure if would be great in Alaska. The advantage this ship would have is the indoor pool and the great Hollywood Conservatory (which is free to access). I’m sure that would improve the Alaskan experience. While everyone is entitled to their opinion, I suspect those with a need to complain will find a reason to do so and forums give them a chance to so without needing to reflect on the reasonableness or otherwise.
If you come prepared to have fun and enjoy your experience, I’m sure you will have a great time.