Forgive me for writing a book on this, but I gotta say why lovefilm was so awful. I had lovefilm earlier this year. I think it's the worst one out there, and be careful because many other home rental services are powered by lovefilm (like Tesco). The reasons it's bad are (unless they've changed since June of this year): first off, they didn't let you list the films you like in numerical order. And this matters if you like to add movies to the bottom of the list just to remember that you'd like to see them at some point, and then lovefilm skips your top priority movies and sends you the movie that was lowest in your mind. Anyhow, numbering them makes a difference, and both Amazon and Blockbuster lets you number choices.
The worst thing is that if you want to cancel lovefilm, you have to call on the phone and it's a long process and they keep calling trying to get you back (blockbuster and amazon both let you quit online, and neither one has called back to harass us -- I tried amazon and quit in the summer because at that time they didn't have an unlimited plan, and I'm back on Amazon now because they started an unlimited plan). Also, if you you send back a film and lovefilm never receives it, you have to call them and wait for them to send you a form to fill out. They don't have this form available online, you have to call. One time I called them for the form and they never sent it. I got the movie a couple of days after I called, so it turns out I didn't need it -- but if they had actually sent the form when I asked for it, I would've received it at some point. Both Amazon and Blockbuster will let you report a disc lost in the mail on their Web site, no need for a phonecall or a form. I would avoid Lovefilm like the plague, because customer service is important.
Blockbuster is good, but if you check out a lot of movies they eventually stop sending you many new releases. You'll still get a lot of movies, but they'll only be older ones. Which is why we recently switched to Amazon. Amazon is also good, but they make sure you can't get as many movies (they take a long time to mark the movies as received and then dispatch new ones, whereas Blockbuster would get it the day after you mailed it and send another one out the same day), but we still get enough movies, and they're new releases, that we are satisfied for now. If it gets to where we can't get new movies anymore, we'll switch back to Blockbuster.