The repo overview page combines nicely the latest commits, history and tree view of the repo. But once you choose a given branch you are moved away from the overview.
Would be great to have a branch/tag/master/head chooser on top of the repo browser. May github could be a inspiration for that, you choose the branch/tag on top.
Give the nice views phabricator already have, may a "compare branches" view could be a premium?