Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not so hot

I gave this a good try, but it didn't work for me. While flashy, the lessons were frustrating because they assumed I already knew vocabulary, sentence structure, and grammar. When I tried to find a way to learn the vocabulary directly, I couldn't. I suppose this is the "immersion" technique. Personally, it felt like an exercise in futility. I would rather learn material, then work with it, instead of working with it on a basis of ignorance. With no options for straight-ahead memorization, and with the frustration factor too high, it was adios muchachos.