Plus, let's face it. Ignoring the Sith, there' no real threat. We're going into a prison full of criminals, yes, but we are 3 trained jedi going against an untamed rabble that's been stuck in a confined prison cell for the last god-knows how many years.
And 3 is probably 2 more than the average group in that prison anyway so that's another thing.
And the ones that aren't stupid or crazy are cowards, meaning they'll leg it at the sight of us.
They're just lucky we're not morally allowed to kill them.
-"I'm sophisticated, charming, suave, and debonair, Professor. But I have never claimed to be civilized."