Nancy,
When RCI introduced MTD I was very unhappy, as we have experienced the same concept on NCL and Princess. Wehave lways had traditional late seating and were happy with that! However, we just had MTD on the NV during March, and it worked perfectly for us. We did make reservations for every night (usually between 8 and 8:15) and had the same waitstaff every night. We never had to wait for "our" table and were in and out of the dining room in about one hour, which was great. We were travelling with one other couple, and requested a table for 4, which we loved. Also, there were lots of tables of two at the windows, something not seen in the Main Dining Room......usually two tops are in the middle of the room, not at the windows. I think MTD works well for small groups, 2/4/6. While I have always enjoyed traditional dining, I didn't notice much difference doing the MT, except that we could change our dining times every night. No wait for tables (Princess gave us beepers, NCL was a bit of a free for all), same great service and servers, and dinner moved more quickly. I would do it again, no problem. In order to participate in MTD you have to prepay your tips (waiter, assistant waiter, head waiter and room steward), but our service was great all around, so no complaints.
Reggae, you are right, Voyager class doesn't have a separate Diamond lounge, so no CL access except on Freedom class ,Oasis and Allure/