In the production industry, when most people think about editing software, their minds don't go to Windows Movie Maker on a PC. I'm not an expert on how to achieve that, but I gather a revamped look (which seems more like a professional editing suite) that retains the intuitive, user-friendly feel would be a start. The issue may not be with Movie Maker, but more so a computer's ability to handle the rich files (raw video) and storage required to edit.
What I like best abut Windows Movie Maker is that it is so simple to use! It's been the standard movie editing program for me for a while now, for basic movie editing needs. There is no need for countless controls and buttons. The interface is so simple and easy to use. Easily import footage such as photos and videos, and easily edit/cut and combine them all together. Even very easy to add pre-made transitions without having to manually animate them.