doesn't give me easy access to the source, browseable and searchable, I can't link to it when discussing with a colleague via chat, can't browse the docs and the wiki and I can't update them. It's a minor advantage at the cost of running yet another piece in my infrastructure that may die or exhibit problems. We use nexus as a proxy for various repositories and so far I've had nexus down more often than github.
You can host your own Nexus servers, for whatever that's worth, if you were unaware. Again, adding more infrastructure, but it at least solves the "it's down on the internet!" problem.
we are hosting our own nexus servers - but they tend to have issues of their own. Bugs, repositories get broken, storage full, machines down for maintenance and patching, yadda yadda. Githubs track record at being up is better than our nexus track record.
