As to the verbosity, the one I quoted looks pretty typical. Here is another one that would have been done around a year ago, then imported into FTM Windows. It's very similar in style:
Ancestry.com, 1900 United States Federal Census (Online publication - Provo, UT, USA: Ancestry.com Operations Inc, 2004.Original data - United States of America, Bureau of the Census. Twelfth Census of the United States, 1900. Washington, D.C.: National Archives and Records Administration, 1900. T623, 18), Ancestry.com, http://www.Ancestry.com
, Year: 1900; Census Place: Indianapolis, Marion, Indiana; Roll: T623_390; Page: 7A; Enumeration District: 158. Birth date: Jan 1853 Birth place: West Virginia Marriage date: 1876 Marriage place: Residence date: 1900 Residence place: Indianapolis City, Marion, Indiana.
So I don't think this is a fluke, it's just how Ancestry is creating their citations. As to how it should be done, that's a whole other issue.
Sending some additional info via PM.