My quick thoughts, being about halfway through the second level (Optimus part 1).

Very enjoyable, I like the options with the arm switching and abilities of the characters. The Ark level was good fun and lots of nice "wheeee!" bits, plus having played through the demo, I could whip through it fairly quickly.

It seems to focus on the characters a lot more now, so when as Optimus, you run about helping fellow Autobots (picking some shrapnel off some dude as an example), so I see why the co-op campaign has gone. The levels seem bigger too, with better texturing, I am suitably impressed with this brighter looking Cybertron.

Love that you go to Perceptor's lab and an Autobot base and can talk with pleb-bots.

Also fairly impressed with the 'audio logs' scattered about the place. One section, I was fighting the deceps and found this glowing thing, and pressed square, and couldn't shoot! Uh-oh! So I dropped it and took out the baddies. turns out it was a key to a room that held an audio log = exploration is rewarded! EXCELLENT!

Enjoying, and was playing before heading to work "oh, another five minutes"
5 min later. "Meh, I am always there early, another five, just to clear this room"

I arrived to work a bit later than usual...