I enjoy the fact that it gives an integrated experience and allows community extensions. This is a big change from atom where everything must be cobbled together, hope that it works and will break. My hope is that the MS team will pitch in on the most popular extensions per language and take them to the next level as well.
To top it off, it's one of the most open development processes I've ever seen. They have a clearly defined roadmap, release schedule and even tell you exactly how they work in the wiki (https://github.com/Microsoft/vscode/wiki). It's fantastic to see such a large company open up like this.