I have never rented a dvd from Lovefilm.
I used to use their online store to purchase dvds on occasion, but one time I ordered a set of DVDs (in September) as a christmas present. Come November, and after much hassling via email, they eventually responded with what amounted to "Erm... sorry... it turns out we don't actually have that item to sell..."
They'd basically just listed something for sale, despite not having any in stock, and having no way of getting any in stock. And rather than contact me to apologise or cancel my order, they just let the order sit there unfulfilled, and it seems like they'd have been more than happy to keep me waiting forever and ever, just on the off chance that one of their employees came across the set at a car boot sale or something.
I've never ordered anything through Lovefilm since. Useless gits.