Most of my friends (20-30 year old gamers/programmers) hate Sony. More to the point, anything non-Sony is good, anything Sony doesn't get a mention. I wouldn't say they're Wii fans, but fans of non-Sony consoles. The 360 and Wii are pretty much in equal standing as far as that's concerned, but more of my friends own a Wii than a 360.
Some of my older friends and relatives have come over my place to check out the Wii. Everyone who's seen it has been interested in it. Most of them consider it to be the next PlayStation or at least liken it to one. For them, it's a different kind of PlayStation. New. Unique. Different. Those are the selling points for them. It offers a different experience to the old PlayStation 2.