Is realflight worth it?
As many have already said the FMS is free to download and fun to mess around with. If nothing else it will help you to learn how to work the ailerons with the plane coming from the left or right. You will also learn what happens to a plane in a turn (looses altitude). This will teach you to use the elevator when turning. You can also work the rudder during a turn and see what a difference it can make. You can learn to do all this with just the keyboard. The main thing is to learn flight characteristics.
You'll still have to put in stick time at the field but at least you'll know what inputs to make to get the plane to respond predictably.