There are a wide range of well made bindings, while individuals may have preferences. Some bindings do wear quicker than others, and I too have a pair of M12s that are a bit flappy, fitted to some old skis. I think the rotation pins are designed undersized. It doesn't concern me, in that I rarely need them, and when I do, they operate OK.
Fairly often, you will see a ski/binding combination offer. Many of these are established combinations, some technical, some commercial partnerships. You can check the binding spec review online.
When it comes to the technical bit, everyone should know their DIN setting, and also understand how it is arrived at. How else would you be able to check that your rental or ski technician hasn't made an error? Forget about DIN settings of up to 12. I don't know anyone who has a need to go much past 7, maybe 8.
To start your understanding, look at:
http://www.dinsetting.com/
You can find charts for most makes, but they are mainly based along the same principle.