I have stayed at the Sheraton Great Wall more times than I can remember. It's on the outer ring road, so it's not that central (but it was convenient for our office which was a 5 minute walk). The facilities are fine, the restaurants are fair and the buffet breakfast is not bad at all. It has been refurbished recently so it should be even better.
If you are on a package tour and it was the Great Wall or the Jinglun Hotel I think that the Great Wall will be just fine and you will be quite happy with it.
Enjoy your stay in Beijing, it's a very interesting city!