Why did I pay extra for the rental of the 3D glasses for this movie?

Rating: 10/10 (13 April 2010)

I saw this movie yesterday and i also found out that the movie was in 3D the same day I went to see it. What a disgrace. I got a unlimited pass where i can see unlimited movies per month for 18 euro. But you have to pay extra for 3d movies.
The movie itself wasn't that interesting. In this movie you can't really say who's the bigger bad guy, Zeus or hades. The princes in the movie had so little screen time that her part didn't really made an impact in the movie.
But the main problem was the so called "3D" effects in the movie. It was awful. They put in the effects after the movie was done, so that they could cash in extra money. There were no 3D effects in the movie. My brother and a friend watched most part of the movie without the glasses, you barely saw the difference.
I'm not a big fan of the 3D movies, I like to have a choice to see the movies normal then with glasses which are of the most times to dirty to get it clean.
I rather that they show the trailer a while longer then the movie itself. The trailer was epic and cool, but the movie was a let down.