OK, then lets try it out and see where it gets us...
Like I already stated, the 360 is my first console ever. So it took me a moment to get a feel for the sixaxis controller, especially for the movement control on the log and the button layout overall. Let me start in saying that I liked the implementation of the motion control. It neither felt tacked on nor forced, and was easy enough to master even for some old dude like me on his first go on a PS controller to feel satisfying.
But I wanted to critizise, and thats what you´ll get. The first thing I noticed, and really disliked, is the tearing. From reading the thread (some having this problem, some don´t) it should be identifyable if this perhaps only happens if the output is forced to 1080, as was the case at my friends. Sadly we didn´t have the time to fiddle with the settings, our wives wouldn´t let us...
Next point: I missed the free-roaming aspect, something that would have been perfect for a game of this setting and theme. Somehow it felt a bit "on rails", as the passages seemed like tunnels.
Fighting/shooting: very nice. Everyone who loved Gears mechanics will like these too, for the obvious reasons. But I really really hope, that the ratio of fighting/puzzles shown in the demo is not the same in the full game. I love adventure games too much to see this end as a shooter with some strings attached.
Graphically I was as (aside from the bad tearing) amazed as well as underwhelmed. Things like the water and its effects are the best I´ve ever seen - but there were also some pretty meh-worthy textures that simply don´t blend with the overall high quality. Thats probably where so much of the fanboy flamewars come from - every side will find screenies to "support" their position.
Conclusion: is, that I came to no conclusion. I´m still a bit cautious, how big the puzzle part, and thus the gameplay will be overall. I´m still sure I´ll pick up a PS3 at some point, and its highly probable Uncharted will go along with it. But it didn´t convince me to get both day one. Yet?
PS: Really, the Firefly guy voices the english? WOW, gotta hear that, as I only heard the (somewhat lackluster) german sync.