Caporegime
English and Afrikaans both fluently.
I loathe people who genuinely think everyone should speak English.
Grammatically Japanese is not particularly complicated in my opinion. I would say less so than English, and it certainly has less exceptions and irregularities. It's generally pretty logical and concise, though like all languages has its own oddities. It's just so completely different to English that it requires a lot of adjustment. The fact that it's heavily context based can also make it hard for a beginner to grasp at first, like it requires a different mindset.
I've not seen complaints of a messy grammar system (some Japanese do struggle with keigo though, which they are generally not trained in until after finishing school). Personally I find it really quite elegant (not including counting words!). I love Japanese verb conjugation.
Note that the two syllabaries have identical sounds, it's only the characters that differ and they are very simple. I learned katakana in a single afternoon.
I think the difficulty in learning Japanese mostly comes from the writing system and just how _different_ the language it is to English. I also find the limited phonology presents quite a challenge. It's a double edged sword though; easy to speak, but the small number of sounds results in many homophones and words that sound extremely similar.