Unfortunately, C2 is so easy to use that a beginner can very quickly make a simple game in no time. This leads to some having much bigger ideas without the expertise to accomplish them.
It's a simple case of unrealistic expectations, whereby the the vision of the user far and away exceeds their ability.
If they read the tutorials and blogs, look at well-structured examples (important) and test often, the mistakes that many run into could probably be avoided.
As with many of these type of programs, a programming background is not necessary, but is preferable to get the very best out of the engine.