I just think it's hilarious that people say that Android isn't configurable..  Especially when most of the talk in this thread have been talking about dinosaur computers.  But seriously, there actually is alot of configuration.  Almost everything about the system can be altered.  Don't like the unlock screen??  Do a search in the App store you can find a few dozen or hundred alternatives.  Don't like user interface?   Search for Home Screens.  Don't like Chromium?  Download Dolphin or one of the other 100 browsers listed. 

Potentially Billions of wallpapers just as there is on any PC running an OS with a desktop environment newer than windows 3.0.  Every Sound event is customizable. 

If you're running Android on a phone you can have it route phone calls via Google voice with some configuration over WIFI to save minutes.. 

Compared to just about any other system on any kind of machine, Android is one of the most configurable across the board, hands down.  Nexus 7 is even better than that because it hasn't been locked down by phone carriers and big name companies. 

Now if you're just navigating menu's to try to change settings, I can see where you're getting that impression.  Do some Googleing to see the different kinds of things you can customize.

Get an OTG cable so you can connect a mouse to your nexus 7 if you wanna try it out.  or  a keyboard if you need to actually type something.  In my opinion this would be mostly to do just for the heck of it, but I am getting my OTG cable so I can use flash drives on it.

-Tom