Impressed with my first look at Gutenberg but it has a way to go (it’s beta):

• needs to be less first world centric; 2.6 megabytes, JavaScript only interfaces don’t play in much of the world
• took me way to long to work out how to include a <!--more--> tag
• inserting an image is more intuitive, oh caption my caption you now make sense ?
• looking forward to the custom meta boxes ticket being resolved, a good deal of the WP eco system and thus a lot of careers are built around these things
• it recovered relatively nicely when I broke the HTML comments used to wrap blocks
• as ugly as the HTML comments are, i like that the posts table remain backward compatible