Echer123 said:
A lightsaber in real life would not have a stopping point.
It would just continue on in whichever direction it's pointed at.
Therefore, it would be completely useless, unless you had to take out an entire army.
There are ways to make it stop. None of these are even hinted at in the movies or any of the books as far as I know, but there are ways.
Then again, suspending disbelief is fairly prominent here, considering men and women of every race get together and move things with their minds on a regular basis.
And being a Jedi is what makes the lightsaber practical. If you don't have the force and training you have no way of deflecting lasers or throwing it long distances only to have it pull a boomerang (Or get stuck in a wall...) and fly back to you (Or not...). Therefore the lightsaber is only truly practical, excessively so, with the caveat that the wielder is, in fact, a Jedi (Or other force sensitive individual).