To be clear, turning franchises into video games is a scam to get people to buy them as presents. "Oh, you liked Buffy the Vampire Slayer? Here's the game they made about it. Happy Christmas." That sort of thing. For the most part the game designers are on a rushed deadline, and they generally resent being forced to work on this show pony crap rather than what they want to do anyway.
Granted, there have been some great licensed works such as Goldeneye and Ghostbusters. The NES was pretty solid with Batman and Jaws, so let it never be said that video games and Hollywood can't get it on like Donkey Kong.
Then again, there have been some game adaptations that make us wonder about the drug problem in video game land.