Magento is an expensive and complex e-commerce platform that requires technical expertise. Its layered architecture can make customization time-consuming and page load slow. Magento doesn't provide technical support and is susceptible to vulnerabilities due to its open-source nature. It is also big and complex, and may not be user-friendly like other platforms. Other drawbacks include difficulty editing complex orders, low-quality third-party modules, and difficulty transferring Magento projects.