We were staying at the Marriott and attending a conference, so The Cheesecake Factory was an easy choice. We split the grilled salmon with vegetables for dinner one night and had a salmon salad the next day for lunch. Both were almost big enough to share (so with a side, it's plenty of food if you have a moderate appetite---and want to save room for the cheesecake). Both were take out, so I can't speak to the atmosphere but I know that The Cheesecake Factory locations in Los Angeles are all very noisy and the wait can be quite long.
If you're a newbie, forego all the crazy cheesecake varieties and just get the godiva chocolate cheesecake. Absolutely heavenly!
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