I just reread my original entry and thought I would post my more recent experience staying at the Marriott Marquis.
I've stayed at the Hilton Bayfront for quite a few years, so it was weird moving to a new hotel. There were both pluses and minuses.
We stayed in the north tower, so we had balconies (which honestly, we didn't use much) and the rooms were recently renovated. Even though they told me on the phone that the rooms weren't connecting and they had no fridges, both of these turned out to be wrong. My friends and I had two connecting rooms with 2 double beds in each room. The rooms were very big, so much so that we were able to get a rollaway bed and put it in the corner and it didn't cause any problems at all, even though there were already two beds in the room. The minifridge in each room was very nice to have cold drinks!
We walked by the Nintendo Gaming Lounge entrance to get to our elevators and so it became an easy evening meeting point for our group, because it was convenient for people going up to the room and people who just came back and wanted to go straight out for dinner. Dinner was always at Seaport Village, which was a very easy walk out the back of the hotel. Another bonus: the back of the hotel led out to the waterside walkway, which was a fast way to get to/from the early morning Hall H line.
The walk to and from the Convention Center was a little longer than we were used to at the Hilton, partly because they make you walk down half the length of the building before they'll let you in. But I also recognize that we're really only talking about a couple of extra minutes.
The pool area is really nice and we met great Con people in the hot tub each night.
Unfortunately there was very little in the way of celebrity spotting. There was one guy staying on our floor with whom I shared an elevator twice. I didn't recognize him, but he had all of the signs of 'afraid of being recognized' and the second time I saw him he pulled on a face-covering mask to wear with his street clothes. The first time I saw him he had an 'entourage'. I checked for his badge but he always had it turned backward and inside his sports coat. Would have been cooler seeing him if I could have figured out who he was.
Overall, I think I like the location of the Hilton Bayfront better, but the Marriott Marquis has lots to recommend it and I would definitely stay there again!