To reiterate, knives labeled "Rostfrei" are not any particular brand. Do any of you have a Swiss Army Knife (a real one)? Look at the blade. Somewhere on it will be the word "rostfrei". Victorinox does this because they make their knives in a country that speaks German (well, part of it does). All it means, as Mike T said, is "stainless".
It would be a fallacy, then, to say "My rostfrei bali was of low quality" and then infer that others labeled "rostfrei" would be of similar quality. This would be similar to claiming that, say, a cheap United Cutlery folder with a blade of 420J2 stainless is equal in quality to a Spyderco in CPM440V stainless because "both are stainless."