Respondents can leave comments to all questions, also ones where they are not asked to leave a rating, such as your Multiple Choice questions or Yes/No questions.
For those, you'll still see a "rating" listed in the table.
Please note that this is just a notation to identify the response given (for instance, for Yes/No questions 1 means Yes and 0 means No). Responses to Multiple Choice questions and Yes/No questions do not count towards your average rating.