Great Venue but....
The JW Marriott & Ritz Carlton at LA Live is a great venue. The Public spaces have that big Wow factor you would expect in this type of venue. I was just there for a conference that had 2,400 attendees. The staff did a good job but they did get overwhelmed. The conference had the lobby under lock down and I can understand why but that was just wrong. As a paid attendee and a paying guest of the hotel the lobby and its amenities should be open. 
As for the rooms at the JW Marriott I was disappointed I had expected a better room considering the price. I have also stayed at the Ritz and there rooms are great.