Users highly appreciate the Mailchimp for WordPress plugin for its ease of installation and use, even for beginners. It offers seamless integration with Mailchimp, allowing the creation of custom forms and efficient management of newsletters. The plugin is praised for its professional appearance, responsiveness, and helpful free plans. However, there are criticisms regarding unreliable API connections, insufficient tutorials, poor customer support, and complex form editing. Some users experienced issues with specific features, like email notifications and accessibility compliance. The plugin's recent reduction in free user limits was also cited as a drawback, potentially pressuring users to upgrade to paid plans. Overall, it aids in streamlined email marketing but could improve user guidance and support.