The lightsaber is the weapon of a Jedi, an elegant weapon of a more civilized age. In comparison, blasters are crude, inaccurate and loud affairs. To carry a lightsaber is an example of incredible skill and confidence, dexterity and attunement to the Force. In the hands of a Jedi, a lightsaber is almost unstoppable. It can be used to cut through blast doors or enemies alike. Using the Force, a Jedi can predict and deflect incoming blaster bolts, and reflect them back at the firer.
Although use of the lightsaber is the mark of a Jedi -- the only ones capable of handling the difficult weapon -- it is also used by their sworn enemies, the Sith.