Joe,
"Great news" and "Two day sale! would be attention grabbers if the body of the message had great news or information about a two day sale. A gotcha is a misleading statement meant to get you to open the e-mail and has little to do with the message. In this case the e-mail even says "Gotcha!" It isn't offensive though, because we all know the style here and weren't likely to be fooled.
When used by, say, Pier One Imports, I have little patience for this ploy. Con me once and your e-mail address will be blocked forever. When you're doing e-mail marketing you have to be very careful to avoid complaints, and it's easy to get complaints.
http://mailchimp.com/resources/ Mail Chimp (seems appropriate, no?) resources, or do a search for e-mail campaign best practices.
PS: Listrack once published a do/don't list that was pretty concise, if you can find it.