This is hard to say. Droiedka's are hard to debate, 2 of them put TPM Qui-Gon and Kenobi on the run, and 3 were at least good enough that ROTS Kenobi and Anakin choose to back away from them rather than destroy them. But Magnaguards are said to be superior to Droidekas, which is wierd because it sure doesn't seem that way.
Also I heard that sometime after ROTJ, Luke and Mara Jade faced a Droideka 2 on 1 and had trouble defeating it.
The incident in reference took place during Survivor's Quest. A droideka was sent during the Outbound Flight-escapade, survived, and when Luke and Mara stumbled upon the remains of the fated sojourn and was attacked by it.
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There is a power through which you can instantly destroy droids, it's called Destroy Droid. Raynar Thul can use it, and I'd wager Vader can too. Plus a lightsaber, Vader could probably take 10 Droidekas.
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After reconstructive surgery, all it took was vader to get angry for him t o crush a room full of metal made of the same substance as GG. with that in mind, he can simply tap into the darkside to collapse the droid's chases
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It took a few seconds to crush all that metal, so I doubt the droidekas will all be crushed at once. If any or them unroll and start shooting at him, he's going to have to block it with the Force or with his lightsaber and isn't going to be able to block the laserfire and use the Force to crush them at the same time, easily. And if it were as easy to crush them with the Force as you make it out to be, why did Luke and Mara have such a hard time taking out a single Droideka?
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Yeah, but he did that because he had lost the love of his life. So unless the droidekas start the match by lightning up Padme, that ain't gonna happen.
Because, about that time, Timothy Zahn went through his mid-life-crisis where he realized that some of the movie characters exceeded those of his own design; Luke Skywalker was essentially becoming the shit when it came to acquired power. In a daring scheme, he decided to draft Survivor's Quest, where a post-Dark Empire Luke and Mara Jade Skywalker stumble upon the remains of Outbound Flight. There, they are encountered by a slightly modified droideka who attacks and nearly kills them. My theory? He does this all to symbolize that droidekas are uber, and Thrawn (pre-GADM days) owned them all in a stupifying display of tactical ability; a subtle indication that Thrawn > Luke.
That said, Luke Skywalker owned an AT-AT. By himself. Easily. And no matter how bad Zahn feels, an AT-AT > a droideka. By, like, miles. So, chalk it up to author's fiat and move on.