i feel the exact same way, and my only theory to explain it was (in my opinion) a lackluster E3 ... remember with the N64 how things just seemed to slow down near the end (before GameCube was shown)
now of course this is just my reasoning, when in actuality i am extremely excited by 1080 (finally), F-Zero, Mario Kart (make it crazy fun, Nintendo, for this might be the last chance to capture some more casual gamers) Pikmin 2, Metroid Prime 2, Star Fox (apparently this needs polish Namco!), and some others that i can't think of because i have to study for an exam that is just 3 hours away for which i have not even started studying