Well there are cases of bias in the NWT, but the examples I would cite are not the usual ones. For instance the 1950 NWT removed most references to “elders” in the New Testament because JW congregations didn’t have elders at that time. In the 2013 revision they put elders back into the text because JWs now have elders.
Another instance is the use of the word “impale” in the old NWT for the execution of Jesus, an awkward and misleading rendering resulting from their extreme aversion of the words cross and crucify, which has now been abandoned in the 2013 version.