I watch the Nostalgia Critic (and other of Doug's shows), Spoony, Cinema Snob. That's from the most popular people. I used to watch Linkara's vids but then I realized his reviewing style is just not to my taste, so I stopped. There's also JewWario's You Can Play This, shorties and other videos by the Full Circle team (Paw, Pushing Up Roses, Todd in the Shadows - they have the best interactions with each other), and last but not the least, the highbrow reviewing style of Oancitizen.
Is it just me or did Nostalgia Critic kinda... suck recently? First we had only some commentaries to old videos, then the LP replacing a weekly review, and then the Giant Peach video - which was supposed to be an apology for the Let's Play, but considering the extremely unfunny running gag and Doug's inability to understand that over-the-top absurdity is what MAKES Roald Dahl stories... I think I prefered the LP.