I wouldn't worry about it. If I had to guess I'd say most of the complaints are from people who are used to the newer, larger ships and the sheer amount of amenities offered. Not that they are better, but the larger ships naturally have more "stuff". The older ships are fine. I've sailed on Grandeur, Enchantment, and Explorer multiple times as well as Adventure and they all offer something unique based on ship size, home port, and the ships age. I believe only the smaller ships offer the shorter cruises you're looking for anyway. You'll both have a great time.