Their recommendations.<p>Despite their overtures to help this, they've really been chasing a red herring. Their big $1M challenge got people to give them a 10% better way to predict what an arbitrary movie's rating would be. But that doesn't actually help.<p>The only thing I want to know is a list of movies that I'm likely to love (and perhaps a warning list of those I'm likely to hate). It's quite alright if they mistake a 4.5 for a 5, and it's alright if there are false negatives.<p>But they still do a lousy job on the actual recommendations, because they're trying to solve the wrong problem.
Availability, I am not sure why(damaged, lost, whatever ) parts of series are unavailable but they don't seem to replace them. I have added several TV series that are a few years old(stuff that isn't on everyone's must watch list but still available on DVD at amazon) and approx. 30% is unavailable.
not being able to clear an account's movie history (whether for privacy or just a change in preference that affects recommendations).<p>no android client.