Tried it briefly...comments:
After login you are left on a screen w/a large "log out" button and nothing happens. I waited thinking the screen would move on automatically after a few seconds to the home page of the app, but it just sat there and I had to choose the Home screen via the BB menu. Better if that logout screen moved on by itself, or better yet, never appeared...immediately after I log in, I don't want to see a log out screen.
When looking at movie detail (page w/the image, rating, etc.) the BB Back button didn't work consistently. The first several times I used it I was taken to a log in screen with user name and password fields. A few times later it started working normally. No idea why...but something needs looking at there.
On the movie detail screen standard BB navigation keys don't work - the trackball is the only way to move around in a page. You can't use 1 to go to the top, 7 to go to the bottom, 1 to page up, 3 to page down, or space to page down. Please enable those navigation aids on that screen...
On other list screens the keys take you through the items that match the letter(s) of that key. Unfortunately this means no page up/page down, which would be more useful to me overall than the letter keys, as I'm most often paging through lists of movies to see what's there, and if I'm searching for a specific movie by name I'll use your "Search" feature. On the "Top 100" list, for example, since the items are listed by ranking, there is no way to move through the list other than scrolling (and scrolling, and scrolling). Page up/down is really needed! So I'd suggest go back to standard BB nav keys on your list screens to allow easier navigation through the lists!
Overall the UI is simple to understand/use, and is responsive as you noted. Queue management isn't there yet, and as I noted, is the most important feature for me in a mobile netflix app.
Good start (I know this is a 1.0)...keep it coming.