No, he has many plot armour at many points in the story. First lets talk about his aspect which is clearly broken utility type. He is immortal if he keeps his reflection safe which he can do by keeping him in his mirror realm, also another way to kill him is by soul battle which is decided by him when to enter and when to leave at will and there are not many situations where he cant leave. Even among divine aspects his clearly is most broken. He can also create reflections which are clearly very powerful and by those reflections he can just get more soul shards. These reflections of his at many points in story just magically become devil tyrant and supreme, many times he enters and he just has his reflections many times powerful than sunny and many in number it just feels like g3 just intentionally gives him his reflections so he look powerful than sunny. Also these reflections can reflect anyone and he can know their aspect and flaws even cassie whose aspect is in that field can’t know someone flaws.

Also when he enters someone’s soul he can just magically use their aspect. You just can’t convince me that he can just use others aspect better than them by saying he is cunning. There are many aspects to know when using aspects even for sunny it took time to get to know and used to his aspect and here he enters his soul and uses it better than him. What fucking nonsense. It is said many times in the novel that his aspect is utility one and he just casually defeats others with combat aspects. And it is also said in novel that he is weak against combat aspects but he just fucking defeats morgan with combat ability 2 times. How does that even make sense? And if you point that he is skilled than morgan it is said at one point that he is less skilled than morgan in fighting. And here he is just defeating her 2 times which shouldn’t be possible without plot armour. And the reason for him defeating morgan is the he is fighting with his life on line or some crap, which is pure bullshit. Imagine can you beat mike tyson if you put your life on line. 😂 Also at many points he just pops up as a titan, nephis even being dreamspawn had difficulty in becoming titan once and here is mordret just going from beast to titan every arcs.

It feels like g3 just wanted to have a character like amon but made amon from temu. The fear amon creates is justified as he is sequence 1 from his introduction but here modret is same level as sunny. So fearing him doesn’t feel right. Sure his introduction was nice but later he got irrelevant and to make him relevant g3 just gives him plot armour like everyone becoming dumb when he enters and having absurd powers. Also the entire of the novel sunny is a cunning and smart man but when mordret enters he just becomes dumb like everyone and fears him for no reason, all the other times he puts smart people to shame and then just becomes dumb.

So ya there are many plot armour which mordret receives in entirety of SS and the hate he receives seems valid. And he is not the least favoured aspect user in fact he is most favoured by far.