Personally I've found, that the longer I study Japanese, the more I find myself in agreement with mr Khatz. The only point I disagree with him on is sentences. I think sentence cards take too long to make and grammar is best learned through repeated exposure to different sentences (from books and so on), and vocabulary is best learned through vocab cards. His general philosophy is nothing new and is probably just common sense in parts of the world where knowing more than one language is normal. He is pretty much aligned with Steve Kauffman's (speaks 10 languages) view on language learning.
jcdietz03 wrote:
"If you listen and don't understand, you eventually will." -Nope, total BS. Understanding something you don't understand involves understanding something you don't understand. Disprove THAT. Also, the contra-positive to this is that if you don't understand and do nothing but not understand, you will never understand.
If you know absolutely nothing about a language radically different than any you know and then listen to the radio in that language, you'll learn nothing. But it will train your ear to the sounds of the language. Once you know a little of a language, passive listening is hugely beneficial even if you only understand every other word. What you know acts as context to guess new words. Even if you don't know the meaning of a word, hearing it over and over again cements it in your memory and makes it easier to learn later. Language noobs overestimate how well they have to know a language before engaging with real content. Pretty much every polyglot on the internet recommends diving in right from the start.