Not very good.
Everything is way too small to read, including the diagram, and the color scheme makes reading even harder. Never have a dark color on top of a dark background. As for the actual lesson, it's of minimal help, if any. This seems to be directed at someone who's never picked up a guitar before, and just telling someone who knows nothing about the instrument, "play this chord", won't get them anywhere. On top of all this, you decision to, on the diagram, make the low e string on the top, where as all standard guitar tablature places it at the bottom, baffles me.
Overall, this is of barely any use. There are countless good guitar tutorials on the web. Sorry to say, this isn't one of them. This needs a lot of cleaning up.