Starscream's death. They couldn't come up with something better? Also Soundwave and Hatchet just because they died of Bumblebee's cannon.
There were crap loads of terrible deaths and three of those deaths affected me the most: Blackout, Starscream, and Crankcase's deaths.
I voted for Starscream, I think his death was the worst, and most suitable for such a coward and a scoundrel.
It's a tie between Megatron, and Shockwave. They were the big two Decepticons and Prime just executed them. You can't even call either of them "fights" Optimus just shows up and murders them both with no effort at all.
Heres how i wouldve had starscreams death. Ok so Sam has shot the grapple into starscreams eye and is stuck. Then sideswipe comes to the rescue, gets sam off from Screamer, throws a few punches and shots to starscream and vice versa, then Sam gives the boom stick to sideswipe then jamms the boomstick to starscreams eye then screamer blows up.
The Fallen for me. I mean damn his face was torn off then had his spark torn from his chest and crushed, in front of his skull! Also I think people are confusing the term "worst" with how lame a characters death was, instead of how painful it seemed.
I don't get if by worst death you mean "most painful looking death" or "most stupid or anti-climactic death" Former I choose Grindor. Latter I choose Devastator.