I tried pasting pictures of a Fresh Bites menu, and food offering, but apparently don't have enough posts to put images in yet. But, you can google them.

Short answer, some Marriotts have replaced "traditional" room service with something closer to a carry-out order. Without getting into the merits of whether this is passable, a little disappointing, or the end of service as we know it, the important thing to look out for is if the room service menu carries a "Fresh Bites" logo on it. If so, that's what you're going to get. In exchange for getting your food in plastic containers, with plastic utensils, in a sturdy paper bag, they also offer the option of picking it up yourself, to avoid a delivery fee. While it's definitely not "room service" at that point, it does make it seem less overpriced, assuming the pick up point is convenient.