I don't have a "favourite" but I do have some that I subscribe to.
Jeremy Jahns is a youtube reviewer who, I think, is actually pretty funny and has similar tastes to my own. I discovered him through a Mass Effect 3 video that went viral. It basically called out the ending and why it was so terrible in a really succinct way. Been watching every since. He's pretty good at his job.
Anthony Fantano is a music nerd. I mean a real, hardcore music nerd. I am not a music nerd. Yet I still watch his videos when the mood takes me because he's articulate and measured in his commentary. I don't even know about half of the musical acts he's talking about most of the time but I still enjoy his critical work more than most.
OSW Review is a video podcast about old pro wrestling. It's often hilarious and sometimes insightful. If you like wrestling (especially if you're familiar with the 80s, or perhaps just interested in going back), you owe it to yourself to watch these. It takes a few episodes to really get going, but by the first Royal Rumble it turns into a great series.