I can't watch reviews for information anymore, only entertainment.
Which is why my two mentions are Vangelus and Jon 3.0 for their humorous spin on reviews and the best Optimus Prime voice that isn't Peter Cullen.

edit: Forgot about Kuma Style. Not the best reviews on youtube but at least he invests in a proper camera setup and knows how to use it. Seriously, one of the best toy photographers ever.