Since the beginning, DC Direct has consistently had trouble with one particular joint. Their toys have never come close to being super-articulated, but they've mostly been serviceable. However, there's a distinct lack of waist joints. In some cases we can... well, not "overlook" that, but at least excuse it. Some characters don't have any sort of a break in their costume there, so a waist joint would look out of place; but what really grinds is when a figure has a visual break, where a joint could easily be hidden, but DCD still forgoes the articulation. Since it's a very elite club, DC figures with waists, we've decided to start a list. Clearly it's not comprehensive, but consider it a start.
If you know any others, let us know in the comments and we'll add them.