1. **Slow Loading Times:** Users often complain when websites take too long to load, leading to a poor user experience.

2. **Intrusive Ads:** Overly aggressive advertising, including pop-ups, auto-playing videos, and excessive banner ads, can be a major annoyance.

3. **Poor Mobile Responsiveness:** Websites that are not properly optimized for mobile devices can frustrate users who prefer browsing on smartphones and tablets.

4. **Complex Navigation:** Confusing menus, site structures, and lack of clear navigation paths make it difficult for users to find the information they’re looking for.

5. **Broken Links:** Clicking on links that lead to error pages or outdated content is a common source of frustration.

6. **Unreadable Text or Poor Typography:** Small, unclear, or poorly formatted text can make it hard for users to read and engage with the content.

7. **Lack of Search Functionality:** Users may get frustrated if they can’t easily search for specific content on the website, especially on larger sites.

8. **Outdated Content:** Stale or inaccurate information on websites can erode trust and lead to complaints from users.

9. **Contact Information Difficulty:** If users can’t find clear contact information or a way to get in touch with the website owner or support, it can be frustrating, particularly when they have questions or issues.

10. **Security Concerns:** Users are highly concerned about the security of their personal information on websites, and any indication of potential security risks can be a major complaint.

Addressing these common complaints and ensuring that your website is user-friendly, responsive, and secure can greatly enhance the user experience and overall satisfaction.