I understand that and my feelings are somewhat similar, but hate Photius gets seems to be about things before his repentance. He did repent from his actions in the end, which is a good thing. If nothing else, he is a good role model for that. He also kinda saved Pope from getting executed by Emperor, so he wasn’t really always at odds with Latin Church. After all, he was venerated by Roman Church too and he did die in peace with Church.
Mark of Ephesus, on the other hand, was surely a man of virtuous life. He came to Council of Florence to help foster unity with Latins and was very anxious to do so- ironically, other Greek Prelates, who in the end signed the Union, were scandalized by how well Russian Prelate was treating Latins and how friendly they were together- they literally viewed it as scandalous to converse with heretics like that. Mark of Ephesus did not. He actually conversed with Latins a lot and won Purgatorial Fire debate (which is why Latin Church now holds Mark’s view as doctrinal, ironically ). Then Emperor decided Mark is dangerous to unity and silenced him. Mark of Ephesus was obedient to Emperor in this regard, but not in regard to signing Union. If maybe Mark was either obedient in both things or if Mark was not obedient in either one, Latins and Greeks could have worked out their differences. Pope even said “we have accomplished nothing” when he saw Mark leave without signing the Union.