DV codec is a poor choice for text and even worse for something blown up to cinema screen size.
Try firstly as Russell suggested to make sure the text is not lined up on sub pixel numbers ( x & y values with decimals)
Secondly try copy>paste the final sequence in either an uncompressed or ProRes final sequence and then render. The text will look a lot sharper that way. Not sure what codec your camera original footage is but I am guess Dv otherwise there would not be a reason to choose that as your sequence setup. If it is anything else, let us know and we might be able to make further improvements for you.