That's a rather alarming install script, especially things like:

    sudo apt-get --assume-yes upgrade

in it. But to your point, I think most of the easy_install packages could be handled by pip. The apt packages look like almost all non-python major components like rabbitmq, apache, sqlite, etc which are best provided that way.

I'm not sure about Graphite itself, but at a quick glance it's not clear why it's all 'sudo python setup.py' rather than in a package.