As a user, Chrome's autocomplete went down the drain for me once they started to fill all fields at once. I tried to autocomplete one field and often chrome filled the other fields with unfitting data. This happened so often that I started to manually complete fields even if autocomplete was available. I still miss the good old times[tm] of single-field autocomplete...

(And for the record: As a developer, I have been bitten by Chrome ignoring autocomplete="off" as well.)