Yes, you can do this in a rather simple fashion from your PC.
Netflix allows you to set-up multiple cues (sp?) for each each account. If you are on a 2 disc per month plan, you can have 1 cue for adults, and one cue for kids. You can then enable parental controls on the kids account, setting it to G, PG, PG-13, R, and a few other settings.
You will need to have the kids account attached to your Netflix Wii account--this is all managed in the same administration screen.
In this way, you can limit the Wii Netflix account to display only movies and shows that are only of the ratings you specify. Movies that end up in your cue but exceed the approved ratings appear as a grayed-put box with a lock on it.
The system is not without fault though. Many all-ages TV shows are not properly rated. For example, we limit our Wii account to PG, or sometimes PG-13, but vintage Doctor Who episodes from the 70s are not viewable unless I remove all restrictions. This is really the only shortcoming, that, and not being able to enter a password to override the setting from the Wii--
you must be on your PC to change settings.
On the plus side,
you can change the restrictions all you want. If you want to watch "Zombieland," you can change the restrictions via your PC/Mac, and the change is mostly instantaneous--I usually have to return to the Wii System Menu and relaunch Netflix, and then I can watch more mature content, change the parental controls after viewing, and things are back to restricted again with "gray locked boxes."
Edited by donssword, Wed Dec 1, 2010 10:57 PM.