(note 1) **Scorponok:** Chased off after surprise attack by USAF

**Bonecrusher:** Killed by Optimus via face removal

**Frenzy: **Severely wounded by shooting himself in the face with his own shurikens. Dumbass.

**Brawl:** Killed by Bumblebee via cannon blast to the spark (heart/soul/life-force) with human assistance. He already had his arm sawed off by Ratchet.

(note 2) **Blackout:** Killed by F22 Raptors and Lennox (shot in the crotch ... ouch)

**Megatron:** Killed by Sam via shoving the Allspark into chest (overloaded his body with raw Energy, killing him). Had assistance from humans and Optimus.

(note 1: Scorponok is one of the smallest Decepticons and was surprised by the aircraft he didn't see, nor could he retaliate)

(note 2: Blackout was distracted by Lennox, giving the jets an opening. By the time he turned back to the jets, it was too late)

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So yeah, humans don't really do much compared to Autobots.