Call be a MB hog but is it really a problem if a full distro is a few tens of MBs, even 100. I find it quite convenient to download everything in one go, more convenient than the smaller downloads.

+1 If I were to download a bundle I would not care about the size and appreciate to get all in a single file.
That's of course if I were to download them I am not quite sure how useful they are in the first place for something like Hibernate. If the bundle would contain some application I need to unpack in order to run it (something like Ant, Maven or an app server), I get the point, but the actually deliverables are most likely (hopefully) consumed via a dependency management tool. The docs are online and the sources on GitHub. Obviously some people thing differently, but I don't think they care much about the size in this case.