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 : ""Disadvantage: some systems can be difficult to use"" is a vague statement perhaps from perspective of someone who does not know the basics of ERP implementation theory, such as: 
 * For ERP to work to its full potential, the users need to have a modicum of education in its basics 
 ** A company with the greatest ERP in the world and zero training in its use ... that company will be totally destroyed in the marketplace of competition by a company that has the worst ERP in the world and great training in its use.  This is because the state of art of success is much more highly dependent on the skills and experience of the work force than whatver data is managed by the computer. 
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