I didn't have any problem with three genders as opposed to two. My biggest problem was the strange overlap of articles. Is there any reason why die is used in feminine and plural nominative and accusative, while der is masculine nominative, feminine dative and feminine and plural genitive? Six words are spread over 16 pairings of gender and case with no logic I ever really found. I memorized it for tests, but I never really learned it.
M F N Pl
Nom: der die das die
Acc: den die das die
Dat: dem der dem den
Gen: des der des der
Ist das nicht ein lotta fun?
Ya, das ist ein lotta fun!
(ducking smoothly, und ;^) ...)