IGN, GS, and GT all have their own live streams with game demos constantly playing when big conferences aren't going on. None of these big sites are going to be embedding some other player into their sites when they have their own players/site layouts for E3 for a single half hour. That sounds like a ton of hassle and a way to fuck things up really fast, especially during such a high traffic period.
While that was probably a factor, a lot of the people that say they skipped it didn't just hear that. They probably didn't even see it on the usual E3 streaming sites. GT, IGN, and GS probably didn't even have it on their schedules, and they didn't stream it on their sites. They may have mentioned it on their site, but probably in a separate blog post. If you didn't actively follow Nintendo it might have been hard to even know about it.
I hope Nintendo gets their shit together and either help get their streams running on other gaming site's video players or even doing a live conference. The latter is definitely a next year sort of thing but the former is definitely a must, unless they want a repeat of last year.