Positive Criticism : Follow the proper way to leave a job from Company
Its always appreciable to make only good reputation and smooth transition before leaving the job. Remember to state all your feedback in the positive tone. Show your gratitude for the position and opportunities you got still hand. This will not only comfort you but it also helps the people like you who works in the same company. Just because you are quitting the door, dont try to close the entire doors. Its not productive idea for you to accuse your negative criticism.