I did not say that the Rosetta stone allowed me to "pass" the JLPT3, but I was merely introducing it as a tool that allows you to quickly build up basic vocabulary (if speed is what you are looking for).
Different people have different learning patterns, but the soft allowed me to quickly learn a basic set of vocabulary, which in turn allowed me to understand the grammar taught during the few hours of classes I took here.
Also, as I was stating, using only one tool might not be a good idea.Combining it with other tools was what made it useful to me.
Now, you are saying that you did not understand anything at all, but did you have any basic knowledge in Japanese when you started using it or did you start straight with it?
The price is indeed excessive for something that allows you to "merely build up vocabulary", and I totally agree on this point, but I think it is still worth downloading a trial version to see.
Anyways, if you wish to have an idea of the "difficulty" of the JLPT level 3, you are welcome to take the test and have a look for yourself. There are plenty of past year tests available.