This is exciting news

After going on two WC's, I highly recommend it for those who have it on their bucket list. It was a "once in a lifetime" experience that was so fantastic, we had to make it a "twice in a lifetime" experience.
I can see it working, maybe because we've done some lengthy cruising on the Navigator before. With fewer passengers, it may be even more intimate than ours on the Voyager...and we became a close knit bunch! The Navigator cabin size works well for a long cruise and Stars will be comparable to the Voyager lounge.
I think what will create a make it or break it experience has more to do with the destinations and the special events (ours were really over the top) not the ship itself. They will likely have the best of the best crew members on board and service will be great. Almost a certainty, you will see remarkable destinations, be very pampered and make life time friends. On such a long cruise, it's easy to "become a family" away from your family.
Like all life experiences, you need to have the right attitude, keep your glass half full, expect the unexpected and be able to go with the flow. We've probably all cruised around individuals who make you scratch your head, thinking If you want to be miserable and grumpy, why didn't you just stay home and save lots of $$ ??