1. Git was faster than mercurial and bazar, eventually mercurial became fast but at that point it was too late 2. Git had a better svn backend, you could try git and get benefits from it even if your company used svn 3. Git did a lot of things that other dvcs didn't do (rebases, partial commits, history edits, local branches)

A lot of the UI simplicity of other tools rests on not doing (3). For example, OP awards negative points for rebase but as far as I am concerned I won't even consider using a UI that doesn't support rebase.