Streaming most content directly in your browser on any tablet is not going to work well, if at all. You need to download the dedicated apps for this to work properly. I use the Netflix and Huluplus apps, both of which work flawlessly on the Samsung Galaxy Tab 10.1 running the latest version of Android (ICS or 4.0.4). You can also stream using the Google Play Movies & TV app that comes built into Android.
On another note, I think it is shameful that Amazon has an Android compatible player for its Kindle range of tablets, but wont release it for other tablets; it has now supported the iPad, so why not other tablets?