Bundles are useful. A bundle is particular type of cpan distribution that doesn't, itself, contain any library code. Rather, it specifies what modules to install (and in what order). You want this in order to resolve dependency issues in modules with complicated prerequisites, such as, in this case, Tk.
(I have no experience with this particular bundle, I just vote here to average out the earlier downvote based on ignorance.)
It's seems that the author of the previous rating is unfamiliar with the Bundles concept. Please see: