I already tried to make a MMD video, but i was too lazy to finish it tho. But i'll try to release a little something when i'll be more motivated.
And it's not that much harder to make an MMD vid, it's just depend of what type of video you want to make. It's a pain to animate the characters, though. And from my perspective it's much more interesting to make, since you can really create evrything (but it requires a little knowledge about the softs).
My favorite video is Changing intetion by mastakaP : http://www.youtube.com/watch?v=J8SYrzDHD74
(the choregraphy is quite impressive)
And everything by wakamurap (http://www.nicovideo.jp/user/1274133
) : http://www.youtube.com/watch?v=6E-QH9AlQaMhttp://www.youtube.com/watch?v=PqJNc9KVIZE