It's still entirely possible to complete. I tried Embrace the Dark Side after the patch when i saw someone else complaining about it. I completed it with mild difficulty in about 10 minutes. The trick is to use palpatine. Wait at the beginning where you spawn and you will always get at least 2-4 enemies running towards you every single time (i did it after patch remember) chain lightning these 4 and that should be an additional 12 seconds of time giving you a little over 30 seconds. Next step is to hunt down the rest in their castle spawn. After a little while of trying you should get a feel for the spawns and patterns and it'll be easier
