Using OpenShot I was able to make videos, edit them, insert new sections, add soundtracks, make a groovy 3D title sequence (using Blender behind the scenes). I exported output as AVIs and MP4s, was able to select a size format that perfectly suited my target (www.showmedo.com), and was able to work it all out without reference to the documentation. So this is a big vote of confidence in a brilliant project with a bright future. The developer is very talented (and not just as a developer, but also as a promoter etc) and I think it is safe to hitch my wagon to that program.
The few glitches I experienced were not very large and will probably not survive for too long.
As an example of what I was able to do with OpenShot, check out the Quick Overview video here: