You would describe this criteria in your evaluation essay so that your reader knows the expectations of the service and product involved. Without it, your reader has no idea what was expected of these items and therefore cannot evaluate anything from what you write.
The second part of an evaluation essay should present a judgment based on the first section. For example, in the Chinese restaurant instance, the writer should state which restaurant he considers to be the best and should support the statement by listing the reasons he chose that particular establishment. These might include the quality of the service, the speed at which he was served, the cost of the meal, and the freshness of the food. He might further give examples of the service quality by pointing out that the server met special requests correctly, checked in with him frequently, and made sure that his drink was always full.
I do not have evaluation essay ideas.
The basic structure of introduction, main body and conclusion has been in use seemingly forever. You do not have to reinvent the wheel. Use the current and tried and tested structure. Revision is always vitally important. Once you've completed your evaluation essay, put it away for a day or so before coming back to reread it. With your mind fresh be prepared to make whatever changes are necessary.