Is jolly good fun.
Nothing groundbreaking, bunch of improvements from the first one. It's still a chaotic clusterfuck when the combat ramps up, but definitely a lot better. It's kind of like GTA4 meets Just Cause, with giant tenticles of doom and sword-hands and shit instead of guns. You can fly helicopters and tanks, but you can also just plain old fly, and it's way more fun to destroy, uh, everything with your powers instead of the vehicles.
Probably 20-ish hours long too, with lots to do. Definitely worth picking up used.
"Watch and learn, assholes"
30 seconds later, falls through helicopter, killing everyone inside.