I was at the Aruba Marriott about 3 years ago and it was very nice (the Hyatt is also nice). At that time, Marriott was still building the Vacation Club next door. The timeshare and the hotel are both beautiful, but it sounds like the rooms are much bigger at the timeshare.
Aruba is beautiful and the people are very nice. The only thing I did not like is that it is not a tropical island with green grass and trees. The island is more of a desert and the strong winds made it hard to stay on the beach too long.
tasnam- I think Stelaris Casino rents the space at the Marriott hotel.