Yeah telling us to blindly run a shell script is...a quirky design choice. At least it doesn't tell you to run it with sudo like I've seen some other ones do, and the shell script itself is sanely commented.
If the script source is on github and isn't run under sudo, is there a meaningful difference between curl | sh and apt-get install from a PPA, gem/pip install, etc?
Meaningful? In most cases no, but since we're already talking about security, curl'ing the shell script from github exposes you to another attack vector, like MITM'ing the script.
Looked at the site and read the comments which made me think about the HN post yesterday about hiding vulnerabilities in plain site (https://news.ycombinator.com/item?id=10889721). Like your idea though.