Robot Alchemic Drive for the PS2. Why, because it was called R.A.D. and also because it was just a bad monster movie where you got to control the giant robot. The voice acting was as horrible as every giant monster flick ever dubbed, and the dialog itself was ridiculous.
The story was awful, you picked one of three people, generic anime girl, generic fiery anime male, generic 'mature' anime male, with no real discernable difference in ability or even story. You then picked one of three giant robots, which didn't really matter because you got all three anyway. Then you get to find out that you're the head of this once prestigious family, that sunk their entire fortune into making some giant robots, leaving your character more or less destitute. You also learn that space travel is impossible because space is filled with radiation that cannot be blocked by any means and will kill you. Yeah. Then all hell breaks loose and your given a PS2 controller that can remotely control your giant robot, you know, to stop the giant space monster that's attacking the city. Also you can fly for some reason. Now repeat giant monster battles for several levels and there you go.
Oddly it was addicting though. The bad dialogue and voice acting just endeared themselves to you like any good B-movie. The gameplay was odd but also fun. When controlling the robot he shoulder buttons were used to move the legs forward and backwards (R1 and R2 to move the right leg forward and back respectively, and likewise for L1 and L2 moving the left) and then the analog sticks each controlled a seperate arm. The robots can all also transform, one goes from plane to fast robot, one from tank to heavy robot, and the other goes from average robot to some kind of super saiyan robot that will blow up in three minutes unless you beat the stage. The whole game had you flying up on top of a building as your character, then switching to controlling the robot, where you see the battle unfold through your character's eyes. That is until the building you're standing on gets destroyed, then it's rinse and repeat until you beat the game.
I suppose it's just something you have to play yourself to really get. There's just something that never gets old about flying up and riding on the shoulder of your giant death machine.
Oh, and did I mention that one of the endings involves you spending the game actively trying to ruin your 'best friends' life, which means she kills herself at the end. Yeah.