I don't mind them if they are short and part of a larger narrative about the product itself...(like Dicetower boardgame reviews where they dump all the pieces in the box)...but I can't imagine just watching that because it's an unboxing vid...I have a feeling so many people saw that kinderegg vid because they searched youtube for "kinder egg" and not because they wanted to see an unboxing vid, per se.
Unboxing videos are consumer pornography.