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Most CMS's are similar. But one thing that always stands out to me is the WYSIWYG editor. It has to be good. I mean, if it is hard to understand or lacks functionality you're not really giving your client a very good product. That being said, most of the time, the main problem I see...is too much functionality! And clients having no idea where to start.
WordPress deals with this really well, by simplifying down to the essentials, and if you need more it can be extended too.
Here's an article that goes into it more: https://www.footsteps-design.co.uk/wordpress-wysiwyg-editor-awesome/