I think it is alright to sign as you sign your credit cards, in short, your regular signature. However, the more I read and hear about this it seems that it is the US tradition to have cursive signature with full name, pretty much the famous "John Hancock"
Definitely, a full name cursive signature allows anybody who reads the document to know better the name of the signatory. I think I ended up signing full cursive name because I got influenced by the same wording you read. However, I think your regular signature would work too.
DO : San Jose
11/28/2006 : Mailed
12/04/2006 : PD (and Receive Date)
12/05/2006 : Check cashed
12/11/2006 : Notice Date (Received on the 14th)
12/22/2006 : FP ND
01/09/2007 : FP Appt
12/29/2006 : FP Done. Walk-In
07/17/2007 : Interview (ND May 17)
08/22/2007 : Oath (Received Jul 26, issued on the 23d, mailed on 24th)
08/23/2007 : Applied N-600 and Expedited Passport
09/06/2007 : Passport received
08/20/2008 : Sent N-565 (Approved Feb 17, 2009)