I had dinner here on 2/7. The last time I was here was over 10 years ago. The last Vegas steakhouse that I had eaten at was CUT, so that is what I will be comparing my experience to.
Service: Very Good. We had at least 3-4 servers taking care of us (party of 5) throughout the night. Initially dinner was for a party of 4. However, once we were seated, our buddy landed at the airport and decided to join us. I informed the head server (thinking that they may not be able to accommodate) and he immediately converted the table to seat 5 (pulled out stuff from the bottom to make it a round table). Water was constantly filled and table cleared off in appropriate fashion.
Food: We started off with the Caesar Salad and Ahi Tuna/Salmon tartare. I thought the salad was just ok. A tad too much dressing. Same with the tartare. Nothing special and pretty bland. Most of the group got the bone in rib eye (medium rare to medium well). All were cooked well. I thought the medium rare tasty pretty good. Nothing spectacular about it, just good steak. I had the rack of lamb (medium rare) and it had decent flavors. I would take Carvino's lamb chops over it any day. The sides we had were decent (Potato gratin, mushrooms, and corn). We had a nice bottle of wine that the Sommelier recommended with a price point of $85. That was probably the best tasting thing of the night.
The verdict on Delmonico's is that it is a decent steakhouse that it's reputation is based on its name more than its food. I would choose CUT over it any day. They have more selection of meat (cuts and quality).