Yeah he does seem more Cybertron than movie although the colors used are very similar to those of the movie line, particularly Blackout.
Onslaught is not a borring Flatbed truck when he has a Huge BF twin Barrel canon on its back. It didn't have to be exactly the same as its G1 original but an update or modernisation of it or at least something that is clearly based on the original like Classics Grimlock. His design is radically different than the original and the T-Rex mode is also vastly different yet he does fit the Classics profile perfectly when it comes to modernising a Classic G1 toy. Same goes with Bumblebee. He is not a VW Beetle but the vehicle is a small hatchback which does fit with the small everyday vehicle profile of the original.
This Onslaught is radically different to the original to the point that its like comparing Cybertron Soundwave as a modernisation of G1 Soundwave. Same character name and some resemblence but a complete reimagining not an update.
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CB650