One jutsu I hate with a searing passion that should be banned because of it's sheer stupidity, is Kawarimi no Jutsu. I find that anybody using this jutsu thinks of it as some sort of Hiraishin. Sense its not, its simply high speed movement like Shunshin, but with the completely asinine point of running BACK to only put a log or what have you in your place. Whats even worse is that the jutsu is described as, "....users replace their own body with some other object, generally with a block of wood, the moment an attack lands. This creates an optical illusion, making the enemy think the attack was successful." Really? So you just happen to have the speed to move faster than light, or fast enough to leave an afterimage, only to run back with an object from hammerspace for a ,"Ha ha, I fooled you!"??
Granted I could forgive almost all of this, if it weren't for the fact its a general ninjutsu. No genjutsu, no henge to make it look like you; you just do it...
I have never had anyone use that against me in a fight. Nonetheless I would void it cause of the sheer speed on would have to have to do that.
Unless it was prepped beforehand, like it most likely is in the canon series.
But that begs the question, even if it prepared, where are you getting it from? Space-Time? That could work, but cries out abuse. High speed movement? If your moving that fast that your opponent can't see you move out of the way the moment an attack technically "hits" you (I assume the user moves fast enough before the total energy of the attack transfers to you, which is speed the likes The Flash will applaud you for.) summon a log from some scroll, and place it back before they are the wiser, you are already at god-like levels compared to that ninja.
Mad because I should be dead by your Rasen-Shuriken? Its all good bro, I substituted the moment it hit, to give you the optical illusion of me being it, without me actually being hit. Its all science you wouldn't understand.
Alright, let me construct a scenario then to illustrate my point:
Two shinobi are in a battle. Let's say Eric vs Ichirou (Uchiha not Hyuga). Using the hiding in shadow technique, Eric manages to conceal himself from Ichirou's sharingan for a short time. While hidden, Eric takes out a blank scroll and transforms it into a clone of himself. Approaching Ichirou with both, Eric first has the dummy attempt to sneak attack Ichirou from the back. Already at a slight disadvantage because his vision is limited, Ichirou very rapidly strikes at the assaulter with Ameratsu.
Upon being struck, the dummy turns into the scroll, now set ablaze in black flames; Ichirou realizes that he has been tricked just in time for the real Eric to attempt a thousand shuriken attack from his blind side.
Most substitutions in the series were performed by those who were either able to foresee their opponent's attack and plan accordingly, or, like the example, were able to include it in their plan of attack. Once everyone could sense practically everything by part II, the substitution technique largely became a null technique to use, especially since most of the time it was more efficient to just use a regular shadow clone as the dummy (more versatile) or just directly attack the opponent while he/she is distracted.
http://naruto.wikia.com/wiki/Body_Replacement_TechniqueThe trivia presents an interesting take on how ninja in real life used a similar concept, though the exact details of how they pulled it off are a bit vague from just the page alone.
*post-script: The technique requires handsigns according to the wikia, so in order to use it exactly as dictated on the wikia, it would require some build-up of chakra.