It's easier to walk someone through a single command than adding a software repository, so it's a risk factor for someone that isn't paying attention or doesn't know what they're doing. But with that little attention/knowledge the complaints on this page are unlikely to save you.

And if you're in the state of mind to consider the security nuances of curl|bash verses other install methods, you're already past the "should I be installing this?" question and the complaints on this page won't save you. The delay is the thing mostly likely to make you rethink.