In my experience it seems that video games based off of movies are usually horrible, and movies based off of video games are usually much more successful.
Any Disney movie gone video game I can think of turned into a failure. Minus some of the Harry Potter games, which were generally only bought by avid Potter fans anyway.
The Resident Evil movies did quite well at first, Mortal Kombat was alright in its time, Advent Children did quite well in my opinion.
I am curious, if anyone knows of any movies based off of a video game were horrible or good, or any video games from movies that were good or awful? (If this is such a common and unsuccessful endeavor, then why is it continuing on anyway?)