By default it's pretty Unity like. Fortunately by adding just one package it gives you an almost pure GNOME experience. Meaning: all the changes made for Unity-

By default it's pretty Unity like. Fortunately by adding just one package it gives you an almost pure GNOME experience. Meaning: all the changes made for Unity-like behaviour only happen in the Unity session. They put quite a bit of work into making that happen (various blogposts by a Canonical/Ubuntu employee).