Bullet immunity, but no sword immunity?
As we have been shown, highly-trained Jedi Masters are immune to blaster fire. Han Solo draws pretty quickly, and shoots immediately after, but Darth Vader shrugs and deflects those blaster bullets off, like they're nothing.
In real world, you're safer from swords than bullets. Swords are slow, clumsy, and need to be near you to do any damage, and you might -still- be able to avoid being hit by skillful dodging.
A bullet will mercilessly hit you from far away, and its penetrating power is stronger (depending on the weapon and caliber, of course) than a sword's. And bullets are so fast, they're invisible to us.
In the Star Wars world (it's hard to call a place this small a 'Universe'), however, the Jedi can't have ANY defence against a slowly-moving sword, but can deflect military gunfire as if it's not even there, and invite the shooter for a meal immediately after the fact.
Why can't force protect the Jedi Masters from light sabers? If the ability to destroy a planet is an insignifigant power compared to what the force can do, then SURELY a tiny energy field around a Jedi Master should be doable.
Surely!
Or at least protecting the light saber hand. (Hands get cut off so much in this world, I am sure the Jedi Masters would've devised protection against this common eventuality pretty quickly)
Considering what we have been told, and even if we go purely by what we have been shown the force is able to do, the force is incredibly under-used in these movies!
I am sure any viewer with a bit of imagination can easily come up with anything between 8 and 800 000 different ways to use the force in most situations, where a Jedi master or force user is on screen. But no, Luke throws a rock into a switch and jams a bone down a monster's throat after FALLING through a trap door... after expecting a trap (surely no one is stupid enough to NOT in that situation).
Obi-Wan turns a switch off by walking dangerously on a ledge and then walking back instead of using the force.
And... so .. on.
What the heck is the force, when it can almost never be used, unless it's specifically plot-relevant? They should never have introduced 'the force', or they should've made it way more limited, or access to it very difficult or time-consuming, or something (requiring a proper meditative state that takes an hour to attain, for example).