OMG! I don't know if I can sum up my thoughts in a single post... I'll do my best:
1) N3DS - From what I've seen this is the greatest revolution in handheld gaming ever. My DS has been collecting dust for 2 years, so, although I liked what I saw of its successor, I'm not gonna buy it... I've given up on handheld gaming but the 3DS has given me much hope about Wii 2 and in general about Nintendo's future...
2) 1st Party line-up for the wii - SERIOUSLY? IS THIS A JOKE? This year we got a few great first party titles like SMG2 or New Super Mario Bros. Wii. Not many, in fact I'd say a bit TOO few. However, I'd have NEVER but EVER believed that a mere 2-3 months later we'd get such a HUGE 1st party line-up.
A) 1:1 Zelda? Unreal.
B) Metroid: Other M with graphics like that... Can the wii even handle it?
C) New DK - Is it 3D? I don't know but either way it's great.
D) Kirby returns after so many years? Not the best possible game but OK.
E) Mario Sports Mix - It's Mario... I don't remember ANY Mario game of ANY genre EVER being bad.
F) Pokemon whataver - Don't really know what it is but if I get to see 3D pokemon I'll get it ^^
3) 3rd Party games - I've never thought that I'd be interested on a 3rd party game on the Wii, much less post about one but Samurai Warriors 3 doesn't look half bad. Also I've been expecting Epic Mickey for a while.
Overall I wish Nintendo were always like this :D
EDIT: Oh, I can't believe I was so enthusiastic about all this stuff that I COMPLETELY forgot the ONE thing I was REALLY looking forward to... This year's greatest regret...
WHERE'S MY PIKMIN 3?!?!?!!?!?!?!?!?!?!?!?!?!?!?!?! YOU PROMISED ME PIKMIN 3, 3 YEARS AGO!!!
EDIT 2: Actually they didn't forget... I don't know if this site is to be trusted but here it is:
http://www.vooks.net/story-19279-E3-2010-Pikmin-3-still-on-the-way.html