My experience has been that the more things on the menu the worse the lower quality the food is, however it can be executed successfully. Wegmans, one of the grocers in the area has a huge variety of prepared food options. Despite the number of dishes, the quality is consistently high. They put a substantial effort into developing an entre before it goes into stores, and also own a few restaurants that probably help with this. Just one example of how it can be executed successfully.