I've only tried this on wifi but I watched a whole tv show with no problems on my unlocked Streak.
PSA: Netflix 1.3 APK Could Work on Your Honeycomb Tablet
[Update] Also works over 3G. I'm running stock Froyo on an unlocked (unbranded) non-rooted Streak.
PSA: Netflix 1.3 APK Could Work on Your Honeycomb Tablet
[Update] Also works over 3G. I'm running stock Froyo on an unlocked (unbranded) non-rooted Streak.