I don’t think Japanese is easy language to learn. We have 3 types of characters etc….
This is very nice article to summarize why it is difficult to learn Japanese?

When anyone ask me the question, I always say ‘It’s really difficult. Unless you live in Japan or you LOVE Anime/manga, it would be impossible to learn Japanese’. Amazingly I met some non-Japanese who can speak and write Japanese so fluently. In most of the cases, they love Japanese culture itself. Hence they have had a big passion to understand what we talk.

Japanese is totally different from other languages. When Japanese would like to learn other language, it’s very hard even English. We cannot find any similarity to other language. Only Korean has similarity to Japanese. Also Chinese use similar characters as ‘Kanji’ which is originally from China.

Sources: Sakura House Staff Blog