Not bad… but

The visual editor offers a lot to beginners and bloggers, who don’t look for an astonishing design. It is not about what you may or not achieve whit the plugin but the amount of effort to do accomplish the desired design (you would have to write your WHOLE CSS and JS to make it beautiful). In comparison, almost every builder has done the heavy lifting for you, lets say DIVI, Visual Composer, X Theme, etc. and you only need to modify certain things to make it appealing.
I really liked the concept of blocks – although not new – and how was it applied in an interesting way. I think that just adding a couple of extra customization possibilities (padding, line-height!?) would change my mind about using Gutenberg for a project.
Looking forward to see more development and maybe help in the future ??