Well, in general Netflix seems interested in providing content that falls into one of two categories. The first is what I think of as "low barrier to entry" tv shows. These are shows that people can turn on while cooking, cleaning, or doing other things around the house to replace pre-programmed tv channels.
"Many of the most-watched series have been off the air for years, like Star Trek and The X-Files." [1]
Personally, I think this kind of content goes a long way to keeping subscribers on Netflix, when they might have otherwise been tempted to turn on a tv channel.
The second kind of content Netflix appears to be interested in is content that pulls in new subscribers, This could be things like movies that were very recently released, or their own original content (mainly to replace the expensive deals to get those new movies).
But the thing about Netflix is that even a new show that might be viewed by other network producers as a flop can end up being a a good call. This is because Netflix isn't constrained by the same limits that cable tv is. The shows Netflix produces don't need to be blockbuster hits, as long as they can help fill the gaps in the "low barrier to entry" tv that keeps subscribers happy over the long run.
A cable channel can only show one thing to all it's viewers at a time, so filling that time slot with something that everyone likes is critical. Netflix can afford a slower burn with content that might not get a million viewers in the first season, but could easily be watched by several million viewers in the next 5 years.
[1] http://finance.yahoo.com/blogs/the-exchange/netflix-dropped-...