The amount of garbage it spits out in autocomplete is distracting. If it's constantly making me 5-10% less productive the many times it's wrong, it should save me a lot of time when it is right, and generally, I haven't found it able to do that.

Yesterday I tried to prompt it to change around 20 call sites for a function where I had changed the signature. Easy, boring and repetitive, something that a junior could easily do. And all the models were absolutely clueless about it (using copilot)