Underrated and overrated languages

Arabic, Hindi and Bengali are some of the most spoken languages on the planet, yet very underrated when it comes to language learning. It's pretty difficult to find a decent textbook in these languages.

Japanese, French and German on the other hand, if you look at them on a global scale, are overrated languages. It's actually amazing how much material there is for learning Japanese.

Are you a learner of an underrated language? Or do you feel that the language you are learning is overrated?

Even though Chinese is becoming more and more popular, the fact that it is not #1 for English speakers means it is still underrated :3

Also, off topic, what do you guys do when you are trying your hardest to focus on one language at a time but the language lust gets so strong?