I can rarely get it to write more than a one-liner before it misunderstands my intentions and touches something it shouldn't

Is anyone actually seeing things IRL like 46 % of code written by Copilot? I'm using it in RubyMine in a few years old Rails codebase with some complex bits, and while I find it much more useful than RubyMine's already nice autocomplete, I can rarely get it to write more than a one-liner before it misunderstands my intentions and touches something it shouldn't. One thing that I think contributes to this is that the codebase is really messy in places, so often there isn't much good code to parrot, and things that are named like should only do thing A often do thing B on the side.