Totally unacceptable. I get that some people buy the figures to play with first and foremost with looks coming a distant second but I am not one of them. I might as well buy a cheap action figure and save myself a ton of money if I am going to be buying a figure with exposed joints.
If you can never accept any exposed joints at all wouldn't statues be more suitable?
Also I don't think occasionally reposing counts as playing with them.