It's pretty broad, yes :-)
You learn to approach projects/problems in a multidisciplinary way.
More people seem confused about that one, but the New Engineer-thing has little to do with engineering. It's more in the sense of 'engineering your life'.
Anyways, the Dutch(/European?) education system is quite different from the American I believe, so you might not see what makes it unique and, well, good for me. It's actually sort of based on the American way of doing things, from what I've heard.
In the Netherlands, most of your time is typically spent following lectures you have to follow, with very little choice (well, you can not go, but you can't really pick). They're all related to the same subject, three years long and possibly another 3 years after that (for a Master). It's all rather large-scaled. You're just sitting soaking in during lectures and then studying for yourself.
Now ATLAS (that's the abbreviation) is very much centered around the student. There are definitely things you have to do, but they're on a small scale and *you* do them. You work with projects (not that common in the Netherlands either) and you have a big say in what exactly you do. They ask you what you want to achieve and help you get the means to achieve it. The amount of teachers is relatively huge, etc.
Furthermore, it's a selective study (also quite rare in the Netherlands) and you'll be surrounded by other ambitious students, which I think will be very motivating as well. There's no real downside for me.
Depending on how interested you are, I could consider mailing you the motivation lettre.. It's a little personal, but I'm told it was rather convincing so it might convince you too :-)