For whatever reason the lack of two dials never really bugged me, but for stills I could see it being annoying. I guess all these cameras are so inexpensive that a few hundreds dollars here or there doesn't really detract from the fantastic bang for the buck.
Fwiw, if you haven't invested in lenses yet and want to shoot video exclusively, consider the GH3. The image quality seems to be a lot better and it's way cheaper than the 6D and 5D III. Though the full frame look can be cool and the EOS system is fun. Canon has nice interfaces, too.