I find a lot of use for rolls.
expechily when you in mid move and someones streem is headed your way, drop and roll - it screws up their streem (at least when I do it) do to the unexpected motion!
But yes do mind the paint pack! I had a full 5+4 pack and got stuck mid roll - and looked stupid as you can get!
the trick is to roll over your sholders, not your back - and if done right, you end up on your feet insted of on you belly.
It is real usfull on the snake - just grab some air and roll over the top or the thing and land on you knees.
and a superman barrel roll over the snake is fun! and if your good, do some shooting - look like something out of Max Pain! thing is it is a bad landing every time! but practice is good, eventully be able to roll and come up shooting.
You guys are gonna say - its stupid, your stupid, it gay blahblahblah...But can you do it, and done right comes it usefull.
and yes I do it alot. it dose take a little getting used to and faness not to look jacked! but its fun at times!