Beggars can't be choosers and I'm grateful to be able to watch these freely over the web but dang... Some of those speakers can use some peer-to-peer reviews before they hit the stage...
I would prefer to hear the rookie engineers perspective on matters since they tend to be fresh and more engaging. I would also have the gurus present for any corrections and QA sessions.
In any case, it's good to have these available. Especially for those poor ones (like me) who cannot afford WWDC.