I was pretty excited about Nintendo's stuff. Call me a sucker for the interesting titles they had there (New Super Mario Bros. Wii, Super Mario Galaxy 2, Golden Sun DS, Metroid: Other M), but that was more than enough to make me impressed with them. Looking forward to their releases.
As for Microsoft, the only thing I was really interested in was Left 4 Dead 2. Natal looks promising, but I'm reserving my judgment until other things come out for it.
Sony almost had me with Final Fantasy XIV, as mentioned earlier, but MMO dropped the bomb on me pretty badly. They had a really nice showing of games (Uncharted 2, The Last Guardian, the lawl trailer for the PSP Metal Gear Solid game). Overall I was impressed with them.
Ranking them in order for what I liked: Nintendo, Sony, Microsoft.
As I said, call me a sucker for what Nintendo is offering up, but hell, it's working. I would care a little more about Sony if I actually had a PS3 or a PSP. Microsoft, I suppose, just needed to show me a couple more games I could be interested in instead of having Facebook, Twitter, and Last.FM attached to the 360.
Plus, Koopa Kids might be making a return in the New Super Mario Bros. Wii.
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I was speaking idiomatically.