Movie Tie-In Games Mostly Disappointing

Why do video-game publishers bother with movie tie-ins?

The cost of licensing an anticipated blockbuster (like, say, this summer's "Transformers") is expensive.

Designers have to work within creative constraints imposed by the Hollywood studio, and then have to rush to crank out something playable by the time the movie's released.

And usually no one - neither gamers nor moviegoers - is satisfied with the results.