One thing that’s been bumming me out lately is that as my MOTUC figures age, their ankles get weaker (if they weren’t incredibly weak in the first place). I love ankle articulation, but if it’s going to have a hinge, it really needs detents (for ratcheting). I have Tri-Klops on a shelf over my desk just for fun, and getting him to stand up straight was a huge pain.
I find ball-and-socket ankles are often firmer, for whatever reason. Plus you can do the old clear nail polish trick if they’re not.