For me it wasn't a matter of how much I believed because they were largely what I was there for. I was expected lots and lots of fx and unrealistic scenes and crazy flying leaping gravity defying stuff. And since that is what I got, mission accomplished.

I saw Equilibrium a few days later and the fight scenes were very different. Some were more unreal, although with a worked out explanation, and others, (particularly the one near the end) were absolutely real-time stuff. I must say I actually yelped and grabbed the chair and was flinching with every shot. Not only were the characters in the combat in danger with every move, but the story put the characters in danger. I wasn't sure who was going to win, by action or by plot.

I go to different films for different reasons. If the love movies gives me a "two kleenex" story and the zombie movie gives me legions of the un-dead, then I'm fine. Mix them up and you had better have a very good story or I am out of there.

Katja