Other than the awful name "Scrum Masters" which has prompted visions of "Scrum Mistresses" or, worse yet, "Scrum Slaves", I think there is an issue about being "ceritified" for anything simply by doing what might be equivalent to reading a book.

Two days in a class, like reading one or more books on Scrum, might be enough to understand the ideas well enough to implement Scrum or to be a "Scrum Master" but it is not sufficient to be certified in anything significant, it seems to me.

So, unless we want a profession where certifications are meaningless (uh, I might be too late on this point, eh?) this certification, compared to a simple certificate of completion, seems at the very least unfortunate.