According to an old Gamefaqs poll a few weeks ago on which company had the best E3 2010, Nintendo got the most votes. And I know it didn't win the last couple years.
I have always given it up for Nintendo every summer since 2008. Last year it was (still) SSB Brawl, but this year I've got finally more games for Wii, which include Monster Hunter Tri, Sega All-Stars Racing and Tatsunoko vs Capcom.