I played the demo, and I am ready to buy some freaking Kryptonite.
User Rating: 3.6 | Superman Returns X360
First the good news: The flying in Superman is about 90% as fun as flying could be in a game. -Save for the wonky controls & ugly graphics, which were no doubt left sooo strikingly poor to accommodate the need for superspeed-FPS. It comes off very Last-Gen feeling. The blurry streaks of city and Superman costume seemed to get all the visual polish, the secondary speed boost special effect is fantastic, and virtually nothing else is super about the entire sorted affair. Also, since the character animations are nothing elegant or comic book like it all falls completely flat. I rank it far below Freedom Force, or CoH/CoV.
Bottom Line: I REALLY wanted to own a good Superman game for the 360. But the demo left me instantly put off.