There are some poor Judges that were appointed by Republican Presidents. Take DeeCee District Judge Emmet Sullivan, appointed by Bush 41. Once upon a time he was tough on Prosecutors who play hide-the-ball on Defendants, but recently he gave a pass to the FBI for "losing" records that would have likely exonerated Flynn, for example.
I'm not making the partisan argument that Judges have been unfair to Trump supporters, but instead making the point that being named to a court by a GOP President doesn't ensure a good Judge.