I completely agree. I'm not interested in Krypton, except as the starting point for Superman.
Lots of people talked about wanting to see a Jor-El action movie after Man of Steel - but I never understood that. Jor-El is not an action hero - he is a caring, sacrificial, scientist father ... and that's what makes him special. But in the end, his son is even more special.
I doubt I'll be watching this ... but you never know. *shrugs*