One criticism I often hear from people watching Aikido videos is that it's too pretty. They say it's not real since the receiver of the technique (the uke) 'throws' him/herself into the technique. They point out that a resisting opponent wouldn't go with the technique, being thrown or rolling out of it etc. And they're right.
What some viewers may fail to realize is that the uke throws themselves into the technique to avoid injury. Real fighting is ugly. If the uke resisted being thrown, more often than not one of their bones would break and they would sort of just crumple to the ground. It is this throwing of oneself into the technique that prevents this injury. In order to practice Aikido techniques realistically, it is absolutely necessary for practitioners to learn how to break fall and go with them. If not, you'd only get to practice a technique once.
In Aikido, as with any art, there are fakers out there, but it is important to separate those people who are acting from those who are trying to avoid serious injury. There's often more than meets the eye.
It's always important to keep an open mind and to research things that are questionable before discarding them.