I'm pretty sure it's ok! I've been to raw restaurants and have been served raw eggplant (marinated and thinly sliced) and have also prepared it myself. I'm not sure of the prep process at the restaurant, but at home I simply cubed it and marinated it in olive oil and spices, skin and all, then just added some veggies. It seemed ok in both cases!
In regards to the above comment, the one I ate at home was the regular large variety. Also, I've seen recipes for eggplant pizza and made a version at home as well, again with the large eggplant. I just sliced it and dehydrated the slices to soften them up.
to prepare a raw eggplant, you have to strain the "bitter" out....to do this, slice it, then lightly salt both sides of each slice, place all slices ontop of each other, and put a heavy plate or bowl on top of the slices to add pressure, a dark liquid will start to seep out, after an hour or so, you can rinse your eggplant, and make into yummy raw goodies.....enjoy.