First of all, Microsoft screwed up in removing the start button. It was completely unnecessary to remove it, and they added no value in doing so. They could have just as easily had the start button pop out the appropriate side navigation, and then let users optionally decide which approach to keep.

Second, I'm sure there will be tutorials built into Windows 8 for people that want to learn how to use Metro and any of the other changes. Some of the comments here seem to ignore that. It doesn't excuse the stupidity of removing the start button of course.