I will say this.  I considered superbouncing cheating.  Even though technically, yes, it was in the game and everyone had the ability to do it, whoever did it first, had a huge advantage.  I can see the argument for the BxR/BxB.  But the Doubleshot, as Carts said, took an insane amount of skill.  Timing the doubleshot properly and aiming took a lot skill.  Plus, the big disadvantage was, if you messed up your Y+Y switch, you were probably gonna die.  Besides, if you were dumb enough to run in a straight line the whole game, you deserved to be Doubleshot. 
  
And Destroyaaa said, I never did superbounce in MM but I did customs just have fun or get out of the map.  I spent hours upon hours doing that.  I actually did something in Halo 2 that I never saw anyone else do.  I combined the BxR with a Doubleshot.  B-XR-RX-Y-Y-R-RX.  I took me forever to get it right.  But it was a lot of fun when I finally did.