Overall, this is the best maiden voyage I have been on, and I have been on a number of them. One reason is the ship was already complete before Carnivalization took place. There are some minor glitches - ice machines not working on passenger decks, no ice buckets, things related to Americanization of the ship. But there are refrigerators in the cabins and the A/C blows cold. You can get bags of ice from room service. There are a number of USB ports in the cabin. I don't see zillions of technicians working on anything and everything. It couldn't hurt that the President of Carnival was on the ship for the first few days of the cruise.
Some of the crew is new, some are very experienced. I heard some of the crew weren't able to board in Barcelona so who knows if they caught up or will join in New York. I recommend avoiding the casino. I don't like what passes for pepperoni at the pizzeria, but it was the same on Celebration and I think a European source issue. When the ship reaches the States they will use Americanized pepperoni.
Many will complain about the open seating brunch, breakfast. lunch, and perhaps dinner waits. If you check in when the venue opens, there doesn't seem to be a wait. If you check in when most of the other passengers check in, there can be a substantial wait. Checking in for dinner a little before it closes has relatively little wait for us, and it really doesn't matter. If you check in before the venue closes, they will serve you. The ship doesn't run out of food. The comedy club is, as expected, popular. The shows in the main lounge seem well attended.
We've had no issues getting off of the ship in ports or back on.
To sum it up in two words - No Regrets.