It wasn't that bad when I went through it TAAATS!
The college gives you the basics is all. You might come out feeling like you know it all (or at least most of it) but when you get the field you learn the specifics of your location. The college is aimed at being reasonably generic yet still giving you the basics.
It was a good grounding, but the field will really sort you out.
I was off a tower course, so the enroute stuff might be a bit different but I suspect not.