I won't go through all of them, but I will talk about German since I'm studying it right now. I'm heading into my second year at the University that I attend.

I'll just say what I dislike about it. The three different genders: masculine, feminine, and neuter. The dative case: Seriously! retarded.......

That's all I have to say about that. However, I am enjoying the language very much and intend to go as far as possible with it. I would love to learn as many languages as possible.