Anyone that would benefit from this style of learning (rapid, focused on structure and rules) may actually be hurt by the rush to cover many topics without treating any precisely. I'm by no means an expert but here are some issues in just the first section.
* example that glosses over the difference between a topic and a subject is frustrating because, in fact, the similarity is fairly superficial.
* there is no "a", "an", or "the" in Japanese, however to specify "this is the car" (implying that it is in answer to some question about which car) one would say これが車です。Using the が particle instead of は.
I'm always on the lookout for useful resources. So far, Tae Kim's guide [1] has been the best I've found. Kim doesn't assume much about the reader's pre-existing knowledge yet he is able to remain succinct.
* example that glosses over the difference between a topic and a subject is frustrating because, in fact, the similarity is fairly superficial.
* there is no "a", "an", or "the" in Japanese, however to specify "this is the car" (implying that it is in answer to some question about which car) one would say これが車です。Using the が particle instead of は.
I'm always on the lookout for useful resources. So far, Tae Kim's guide [1] has been the best I've found. Kim doesn't assume much about the reader's pre-existing knowledge yet he is able to remain succinct.
[1] http://www.guidetojapanese.org/learn/grammar