Usually it's their moments that have been pushed to the extreme, but I wouldn't say remove the limits on them, just the common concepted weakness. For example the AC Super Tank, somehow most people have the impression that tanks are slow moving, well AC's Tank can blaze a trail through snow faster than a normal car on road. Anybody who watches Top Gun knows how Planes are suppose to move- Well try one that can spin on it's sides. Power Suits are expected to be unbalance, well these move faster and more agile than humans.
But the easiest way to make your machine feel insane? Have the characters themselves admit that it's crazy

Dragon Rider is so fast that the user needs a power suit to grip the machine while it's going 400kph (Not top speed), at the same time a human can't breathe under those conditions so the suit has to compensate for that. Also at 1000kph, everything becomes a blur to the human eyes, and the testament like computer of the power suit directly inputs all data into the rider, allowing him to control the vehicle.