These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Values Dissonance - Medea would be a Villain Protagonist to us, if an extremely sympathetic one, but to Euripides and the chorus, she's just tragic. In both cases her acts (particularly the murder of her children, born of a foreigner or not) would have been unconscionable. This also applies to Jason.
What an Idiot - Jason abandoned the woman who had sacrificed everything she had, AND put a Mama Bear's children in jeopardy. Not to mention the woman he did all this too was the granddaughter of a freakin' sun god! And his patron goddess is Hera. You know, she of the doling out horrible punishments to the other women, which is exactly what Medea does to his new bride.