The problem is really that SQL isn't the easiest way to, starting from nothing, take some data, manipulate it and display it on screen. You have to take a couple of steps to set up a schema, take the data you have, convert it to that schema then manipulate it and display it on screen.

Mongo and its ilk give you instant gratification and a tremendously false sense of productivity. It's the easiest way for step 1 without question, it's steps 2 and onwards where it starts to show its problems.