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My impression from Major
My impression from Major Nelson's interview with the developer is that they funneled you into several important aspects of the game quickly in order to give you a taste of important features (2 plasmids, 3 weapons, security cameras, hacking security drones). I think the opposite side of the coin would be "WTF. This is a demo and I have no idea what to do or where to go. How am I supposed to try out the game with no structure?"
The many ways to interact with the environment provided a lot of enjoyment for me. Listening to the recorded messages and looking around rooms gave a pretty neat glimpse of what Rapture used to be.
I do not enjoy linearity either, but I see the necessity of it in the demo.