I'm honestly not that surprised. Comic book movies have never made more than 30 mil $ there, even The Dark Knight is at $29,669,980, Spider-Man 3 is at $29,504,724, Iron man 2 managed $9,254,348 and Thor is at $16,007,303. The X-men franchise hasn't even cracked 20 mil.For comparison, American Pie 2 managed $30,812,120 and it came out 11 years ago. The Hangover II made $42,168,493 last year, so I would say normal for the market.