Yeah, the great thing about Mandarin is that it doesn't have a bunch of grammar rules and all. European languages on the other hand have so much needed grammar and less efficiency over Mandarin Chinese.
Japanese has an easier writing system (in Japanese if you forget a Kanji character you could just compromise with writing it's hiragana equivalent. If you forget a Hanzi character in Mandarin. . .Well, you're basically screwed)
Hey you guys, you should vote on a debate I just had with Balacafa, "there is no god/gods." We finished it like a week ago but it still doesn't a single vote. I'm not asking you to vote for me but vote for someone; the anticipation is killing me
Difficulty is very much subjective and depends on your native language. I've never learnt Japanese, nor will I ever have a need or motive to learn it, but I'm pretty sure it will be much harder than Mandarin was for me.