I always think it looks odd to watch someone swing it out. In my opinion, the body lines on the car suggest that the door should swing upwards. Look at the picture below and try to forget everything you know about our cars. Check out the sloping curve of the door and maybe you'll see my point.
The first time I showed my designer friends the Exige, they all said "Shouldn't the doors swing up?" I always assumed it was because of the Lambo legacy or whatever, but maybe it's because vertical doors make the most aesthetic sense? Who knows.