In Ninjukai Taijutsu rolls are vey common. As well as learning attacks from stances and movements we also learn to execute the same attacks when recovering from a roll. Forward rolls,side,rolls and back rolls,rolls over low benches and off low benches are all part of the syllabus.
I must admit,when i first started it took me a while to get the hang of even the most basic of rolls,trying to end up where i aimed instead of aimlessly rolling everywhere, and i didn't really see the point of them apart from them looking pretty stylish.
But now i see that the ability to roll is an effective skill to have. Firstly it can act as a breakfall,instead of breaking your fall you can go into a roll which would be effective if you were suddenly pushed in the back or shoved to the ground from the front.Not only would this roll be unsuspected by your opponent but you recover from your roll very low and in a good stance if done well.
Secondly if the terrain is right ie. relatively soft then a roll can be a great way to create distance between you and you're attacker or alternatively a very unsuspecting way of charging in close to your attacker and as you come up you could snap out a knee to the attackers groin for example.
There are other great advantages but thats enough rambling for now...
much respect
-andrew