I'm sorry you're having problems. But keep in mind that this is only the 3rd version of this program and one where they added a significant enhancement (3D). After Effects is in version 10 or so; one must expect it to be a little further along in terms of stability. Even so, there are still things that can be done much easier in Motion than in AE.
I'm sure if you read the forums, you'll find all the issues plaguing this software, but there are also plenty of people out there who are getting the most out of Motion and are doing quality and professional work with it.
Good luck with AE, and the AE forums.
Andy
PS: Wait until you have to learn expressions. If that doesn't make you want to pull your hair out... 🙂