In terms of having 'new' content, it didn't have any big shock factor compared to previous E3 events. However, the last 2 E3 events didn't really do that either, aside from Metroid Other M being announced.
However, in terms of full media blowout and content, this does blow previous E3s out of the water. Pretty much ever since 2006, Nintendo has been pretty much set in a formula of 'show off some new games, Iwata wags his finger at the industry, show off one innovating feature, end E3'. The old Nintendo that surprised us with something that blew us away, such as the reveal of Wind Waker or the DS and Wii, are gone. Now they're playing it safe and choosing to release their big announcements in 'Nintendo Conferences' or media events like this.
Pretty much, with everything they showed off in this event, they have little left they can show off at E3 this year short of new games, a new DS, or Zelda/Kirby Wii.