blender calculates some mysterious frames while exporting. I waited up to frame 100, which took me 2 minutes, and then I had enough and killed the whole thing. I don't know what this program dreams of, but my model is definitely not animated. It was rendered corrected in the render preview though, with textures and all, I guess it is just me doing something wrong in the exporting dialog. But I think this is not very hard with this strange interface.

In short: .obj->blender works, blender->.md2 calculates some frames all the time and doesn't come to an end