We have sailed with Royal Caribbean previously and it's always a very enjoyable trip. Their service is always phenomenal! Our room steward, waiter and assisant waiter were attentive and added so many personal touches. They made it so enjoyable for our daughter and were so sweet to her. We loved them!
We sailed last year on The Liberty of the Seas. The Navigator is a bit smaller but is set up very similarly so it was very easy to find our way around. The Liberty has a bit more to do and sometimes we felt overwhelmed and like we had to fit it all in. So the Navigator was nice if you are really low-key and like to just relax at the pool on sea days.
We had the later dinner seating and on a few nights we had to go to the show before dinner. Would have preferred to go after dinner as there wasn't much to do after dinner for families. We also weren't really able to use Ocean Adventure club for our daughter because by the time dinner was over we usually just decided to go to bed. Plus it was into the time frame for which you had to pay for the childcare - we couldn't get her there in time after dinner for the regular hours.
We felt like the entertainment was just average. The production shows were well-performed but were "old school" cruise ship shows. All of the headliners were pretty good. The ice show was outstanding. Wished there were more family friendly evening activites. Last year on the Liberty we did family karoake. Navigator only had adult karoake. Also,my daughter was so excited to attend the White Party again this year and the Navigator version was not family friendly. There was no food (Liberty had fruit carvings, ice cream, etc.). The beginning of the party had line dancing but by the end of the night there was Tom Cruise "Cocktail" style bottle tossing show by some of the bartenders. It was entertaining for the adults but unfortunately, wasn't family friendly. I ended up taking my daughter and heading back to our cabin. She was disappointed.
But all in all we had a wonderful trip. Royal Caribbean definitely has the service thing down. All employees are so well trained in customer service and really "roll out the red carpet" for their passengers. Also,our cabin was very clean and comfortable and we thought the ship was beautiful. We loved our 7 days and we weren't ready to go home!