It was a narrow corridor and the Droidekas were pouring fire down there. The Droidekas could not get past the Jedi's sabres, but the Droideka's own shield clearly could take as many of the Droideka's shots as needed (odd that Lego SW didn't simulate that). But the Jedi, even if they could have advanced up the corridor, could not have taken any time to swing their sabres because there was so much firepower, they had to be defensive all the time. With no room to manoeuvre in that corridor, QGJ clocked the situation in a second- "It's a stand off; let's go." And then he did, definitely the sensible thing to do. After all, there can only have been more coming.
What i ver understood y not the federation have an army of just droidakas and super battle droids. lol, and crab droids. posted by Aturuth.
I think that is because Battle droids are the only droid that can think rationall, they can control ships, talk and other sort off stuff. Crab droids and Droidekas can't think like that and has no hands.