Buck and I have the $5/month plan, which is 2 rentals sent one-at-a-time. We love it and this plan is quite enough for us. Probably wouldn't watch any more than 2 a month.
Our nearest theater is about 30 miles away, so going to the movies is a big deal for us. To say nothing of the cost of a movie ticket these days. Even if we go to the matinee, it's still a bit steep. Don't even get into the issue of concessions.
One of the things we like about Netflix is the ability to see little video clips of the movies we're considering watching before we put them in our queue. At the rate we're going, we'll have to live to be 200 before we watch all of the ones we want to see.
Nothing better than sitting in our favorite chair, dressed in our jammies or whatever, with a big bowl of home-popped corn! I say go for it.