Which of these languages...

is the most worth learning, in your opinion, and why?

Russian, Turkish, Urdu, Punjabi, Korean, Hindi, Arabic, Chinese, Bengali.

Additionally, which countries that speak these languages are pleasant and which are shitty?

>>16
I don't know man, might need Chinese.

The list is pretty shit anyway, who the fuck needs Turkish, Urdu or Bengali? They'll never become superpowers anyway.