Navigation
The navigation looks clear, but is confusing. The grid on the home page is nice, but the top navigation bar has confusing labels like "collections" and "spotlight" that are far too vague.
Architecture
I don't like the architecture. It appears to be primarily clip oriented, rather than show oriented. When you go to the channels page, for example, all shows in a channel are lumped together, and the menu to choose a show is very discreet and hard to discover. It aims for a flat architecture, but I'm not sure that visitors are looking to browse as much as they want to go to their favourite shows. Also, there are far too many channel options, making it hard for viewers to distinguish between them.
Content/Typography
The content is shown nicely. All the videos are laid out clearly, and labelled with the channel and the season they were from. Watching a video is very clean. There's a lot of extra content below the fold, but the video area itself is separated from it well. One thing that would be nice would to allow switching from a list to grid view over the entire site, since they both have their uses.
Grid/structure
The site uses a grid extensively to lay out the videos, and it makes the site look very clean.
Iconography/imagery
Since it's a video site, most of the imagery on the site consists of screenshots from the clips in question, which works out well. There could be more icons for the channels perhaps. The row of boxes to select the different items in the slideshows is subtle but clear. The icons in the video window are great. They're nice and big, in black and white to avoid distraction, and have a label below them to prevent confusion.
Color Palette
There's very little colour on the site itself. The grey gradient bars are random but don't clash with anything, and the video screen shots add enough colour that it makes sense not to have more colours to distract from them.
Site Focus
The site aims to present videos in a clear manner, and it works well. Videos load quickly and reliably, and the layout is very clean, particularly when compared to services like Youtube.