You could have bought and owned cod4 for the price you paid to rent it for 5 months;-)Do you mean Lovefilm?
I use it, kept COD4 for 5 months! Pay about 15 quid for 2 dvd/games home at a time and unlimited each month. Pretty good service tbh, send back game on Mon and recive new game on Wed.
In the last 2 years Ive recived about 2 faulty disc and they just let me have 3 disc home for the inconvenience