It might look ridiculous to people who don't understand MMA but that's just grappling/wrestling, not everything has to look pretty. It's completely normal that it's not going to work every time during a fight.
But Cain is a great wrestler. He wasnt even getting close to a takedown because JDS' TDD was dope. Cain looked ridiculous because JDS completley stuffed his takedowns and left him on the floor clutching a foot. JDS weakness in that fight was his stand up (mainly defence) and his cardio.