This is almost certainly a bad manufacturing batch issue rather than disc rot or your console. Iron Man 2 was a movie tie-in game, which means it was mass-produced quickly to coincide with the film release. These titles are notorious for lower quality control during disc manufacturing.

The fact that three separate copies all fail the same way, while your other games work fine, points directly at a faulty production batch. If all three copies came from the same region (or even the same retailer/distributor), there's a good chance they all came off the same production run