two japanese voice actors just sound very Japanese and though for Young Rin that’s totally accurate, you’d think olderRin would be better at English when speaking so much.

-Well what did you expect? They are both Japanese. Older Rin is actually good at English. He knows how to respond, he can read, write, understand and reply when it is spoken to him. But since he grew up talking in Japanese he will have accented English. 

My mother learnt english within 2 years because I spoke it so much at home trough skype and such...My dad regained speech over 4 languages fluently after having a cranial infarction...within 6 months, so don’t give me crap that they can’t do better

-How about you don't give me that crap that everyone learns in the same speed? Just because your mother and father learned English fast doesn't mean everyone is like that. People are different. But if you want to compare, okay, let's do that. Your Mother was able to speak with someone who was fluent in English regularly, and even then it took her 2 years to be good at it. Miyano Mamoru lives in Japan, is Japanese, talks to people in Japanese in a daily basis, etc. So why do you expect his pronunciation to be flawless? 

It will take time, I will acknowledge that.

-Then act like it. 

but me and my friends laugh over my terrible accent+grammar period too, and I doubt they will read this so it can’t really harm them that much.