It's an "ok" start, however I would have expected a bit more to be available at the start.
Amazon's issues are not only it's streaming library, but also getting the VOD client out to more devices. Many do have it, but some prominent device makers don't have it on their machines yet like the PS3(not sure about XBox), Samsung and LG BD players. LG is "supposed" to have it on their new line of BD players(BD6xx line), however it is NOT on the players out of the box(the LG app store opens Friday so perhaps this will change). Samsung has it on some TV's via the Yahoo widget but the widgets are exclusive to only some of their TVs and none of their BD players.
There is another problem with Amazon Prime Instant View. You cannot put the movies/TV programs into your VOD folder. There is no "button" that allows that. Even though their site mentions being able to watch programs "later", it can't be done. The only things that go into your VOD folder are purchases or rentals. It needs to be set up like Netflix Instant Queue.
I have written to Amazon twice about this and get a response that does not answer the question. It is mostly a canned response.