Agreeing with Psy almost completely, it's worth pointing out I guess that most complaints levied against Rosetta Stone have been made less true with the third editions of all of it's languages, in particular the problem with difficult to make out pictures. And of all the things that have gotten IMMEASURABLY better, speech practice has probably raised the most.
The complaints are all still true, mind. Just less. It remains absolutely boring as hell, though, and more of a way to give yourself false confidence and sense of achievement and familiarize yourself with the bare basics of pronunciation than anything concrete. So unless you just have the money to throw away...
The most irritating things of all, everything is put in the ~ています form, and there isn't anything even vaguely conversational for the entire four units I tried of the 2nd edition (this may have been improved, but I doubt). Which means that it isn't even a good tool for quickly picking up enough things to speak some of the language for a trip overseas or for business! Would you like to know how to say hello, how are you, how much does this cost, where is this? Be ready to wait a long time before Rosetta decides to broach such a topic. It's apparently far more important to know how to say that the boy/girl/man/woman is currently eating bread. For 20 lessons. Using words for boy/girl/man/woman that the Japanese don't actually use.
The speech practice isn't so bad though!