I like power-dynamic stories of a lot of different kinds, and serious treatments can be fantastic, but sometimes the angsty, sexy mileage you get out of the inequality is part of the fun.

It can be. I really can be fun. I find though that I need to have the author acknowledge that things like Lady/Maid can be problematic on numerous levels in order to enjoy it. If that makes sense? It's when there's no realization that one person has a lot of power over the other in a number of very basic things that I find things weird and not fun.