I was about the ask the same question. My girlfriend and I watch TV shows via Netflix on our Roku almost every evening and the experience is very good. The only problem is everything is a bit dated (with a few exceptions), but it's still entertaining and the back log is big enough to last us for at least a year of casual use.
The DVD service I can't really complain about as it does exactly what they say it will do, delivers DVDs to my door within a day for much cheaper then renting at Blockbuster.
Agreed. I find Netflix "Watch Instantly" to be fantastic. The iPad app is prone to problems, and the content isn't quite there, but it's still unbelievably amazing.
For $10/mo I have unlimited viewing of thousands of movies/shows. For anyone that grew up with VHS tapes that's just staggering.
I have only two requests: Even more content (I'd pay $20/mo for 5 times more content), and a more solid iPad app.
What is wrong with Netflix (besides silverlight)? I used the service for a very long time to satisfy almost all of my TV viewing needs.