For many us who were brought up with Doctor Who being the only cool thing on TV on a Saturday evening, the Daleks were terrifying, even though they clearly had design faults. However, imagine if the Daleks had not been created by Davros and were instead created by Aperture Science instead, now that would be scary! I wonder if it has the voice of GLaDOS!
These are the details on why the Aperture Dalek is more dangerous than the original version;
Aperture Daleks, we EXTERMINATE because we can.
For the good of everyone except the ones not like us.
A Dalek as it might appear in the world of Valve’s masterpiece, Portal.
Source [Geeko System]