This visual breaks pretty much every best practice out there when it comes to effective graph design. Check out this post, where I comment on the design choices and demonstrate what this data has the potential to be.

Slopegraphs can be useful to show comparisons between groups. For example, when reporting employee survey results, a slopegraph can be used to show a given team's feedback across survey categories compared to the overall company. Check out this post to see an example and read more about slopegraphs.

When it comes to slides that communicate data, I don't typically recommend anything other than a white background. That said, sometimes there are considerations outside of the ideal scenario for communicating with data. Check out this post to see what I did to visualize data on a dark background.