Interactive movies, aka scripted games

I downloaded the demo for Splinter Cell 3: Chaos Theory because it looks pretty cool and the subject matter seemed interesting. The graphics and effects are beautiful, even on low detail, and the sound is awesome. But after playing for about 20 minutes I felt like I was playing an interactive move... a script that I must follow, killing people along the way. It was like walking through a haunted house... one way in, one way out. You can't go exploring, you can't try other ways around things. And the dialog reminds me of games from 10 years ago. Like the enemies saying "What was that sound? I guess it was nothing". If I wanted to watch a movie, well, I'd watch a movie. This game would be awesome if it was freeform. Just tell me what I have to get accomplished and I'll do it my own way, find my own routes and have more fun.