Spent the weekend at Center Parcs and although we didn't have a terrible time, I don't think it lived up to the advertisments.
The chalets were quite ugly and there was no real "countryside". (Not sure what I was expecting, maybe a proper forest where you could escape from everything) but there were chalets everywhere. The activities were all very pricey and the restaurant we ate in was really grim.
I won't be going back in a hurry.