It depends on the person. Some might see something, take it at face value and move on. More curious minds are willing to take a second look and dig further. In that case they might end up learning the truth about something. And that makes it all worth it.
Discussion
I'm not sure people tend to seek out nuance, on average.
I guess I’m back to my first point, where memes can communicate simple and powerful truths very effectively. Even if someone is not bent on seeking out nuance, memes are also quick to remember and can hit the subconscious in a way that other forms of communication cannot. Once in the subconscious, it can become a seed to be drawn upon when the opportunity presents itself. So whether or not the audience thinks critically or takes things at face value, memes can be effective either way, making it a very powerful communication device. It would be unwise, in this day and age of exponentially shortened attention spans, to disregard the value of memetics.