Although we cruised a while ago on the NCL Joy (December 2017 and April 2018), I thought our experiences might be useful to share now that the Joy is leaving the Asian market. I will aim to keep my comments to points that may still apply in the new market, so won't bore you with the dismal embarkation experience in Shanghai! The ship was less than a year old when we sailed, and is beautifully fitted out with that luxury feel.
We booked a Concierge Suite, which I believe is unique to the Joy. I will comment below on the details of the room, but included with the room were a number of privileges, including access to a dedicated lounge where breakfast and lunch were served daily. The lounge we used (which was located directly above the bridge) is going to be opened up to all after the refurbishment (Observation Lounge), which is a shame as it was a glorious quiet location to hang out (with amazing views), but the website is still promising private dining. We also got access to a concierge desk, a free go kart ride and a free laser tag game, the "unlimited beverage package" and 6 speciality dining coupons.
We did not visit the MDRs as they exclusively served Asian food, but the Gardens Cafe buffet had a great selection of asian and western food. We mainly though dined in the speciality restaurants. Many were the usual NCL offerings: Cagneys, La Cucina, Teppanyaki, Le Bistro and Food Republic; and they were all good. Food Republic was particularly good for casual dining. It is disappointing to see that they are replacing the Chinese Hot Pot and Korean BBQ with a "social comedy and night club" - it would have been nice for the ship to keep some individuality. There was also a great Noodle Bar which is being replaced by a fitness centre; and also a wonderful Grand Tea Room which is being replaced by a Brew House.
This room was massive, with a double sized balcony. It was nicely furnished and the bed was very comfortable. The bathroom was a good size with a shower over the bath. There was a massive walk in dressing room/wardrobe, with more hanging space than my house. The mid-ship location made it close to everything.