I'm not going to lie. Usually I hate watching other people play video games. This is mostly due to the fact that I'd rather be playing them myself. However, the Runaway Guys are quite enjoyable to watch when they perform their Let's Plays.
They've just recently started a new LP with Super Mario Bros. Wii, in this case recently meaning in the last couple of months. They're currently up to episode 7. Below, you'll find episode 1. I find the commentary between the three regulars and their guest to be rather humorous most of the time. Okay, really I just enjoy the rivalry between ProtonJon and Chuggaconroy (They're constantly trying to kill each other.)
You can find their Youtube page (As well as their other videos) here.