We have just completed a cruise on the Celebrity Solstice. We boarded the ship in Auckland New Zealand on February 17 and disembarked on March 21 in Sidney Australia (32 days).
I will try to leave my personal opinion out of this commentary and just relay factual observations of our experience on the ship. We are Elite + members with Celebrity so we are not new to the line. We also have very high status on several other cruise lines.
The first impression of the ship that you get is that it is a tired, worn out old vessel. The walking deck (5) is worn out, meaning that the deck base material is showing through the surface coating and looks worn out and decrepit, all of the metal surfaces are rusted and give you no comfort level if you were dependent on them in an emergency. There were dead crickets, spiders and assorted bugs everywhere. The ship overall is dirty, worn out and quite tired.
Very long in the tooth, see above review.