For me the movie was a victim of the typical game-based-movie.
Thoughts of those involved in architecting the movie :
"Hey, this game is AWESOME."
"Ya, I know, It's so cool. I love everything about it. There should really be a movie about this."
...
"Let's make a movie!"
"Ya!"
...
"Now that we know we like everything about the game, LETS CHANGE IT ALL FOR THE MOVIE!!!"
"YA!!!"
...
<months pass>
<movie comes out that generally skims the look and feel of the game, is a partner in spirit, but in execution is largely just totally different and pretty much unrelated.>
<people's reaction : "wtf" or "...">
-scheherazade