Almost as good as human translators at getting the basic meaning right and putting words in the right order, for similar language pairs, translating wikipedia articles. The skill of human translators isn't based on getting the information right, that's a given. The difference between a good and a bad translator is how well they capture the thoughts and intent of the speaker, whether they can make their audience feel the same way as the original did. I say it every time one of these articles comes up, a machine capable of universal translation will be none other than a true AI.