[quote name='Rhett']Nope, no rating system for completion. Just 'ghosting' which further alienated two types of gamers (hardcore vs casual, lol) and was self-inflicted, where you couldn't even give them a hint that you were there, or you started over.
I think there was an end-of-mission report on kills/alarms etc, though.
As for the beginning, that was a thrown-together tutorial for you to learn on, and the first three soldiers were scripted to be your bait. Overall, the demo was made for Mark and Execute abuse, and the actual level's layout is entirely different. These are also the lower (lowest?) tier of 'enemies' you can go up against, where they aren't really trained or prepared for Sam or Sam's training as a stealth operative/spy. The tutorial in the full game happens while in Sam's house, during a break-in.
I recommend playing the demo on Realistic, if you haven't, as it adjusts the AI's perception (they'll see you sticking out of cover etc etc) and search patterns, and also how fast you die. However, once you get used to it, Realistic is also rediculously easy. Then again, easiest enemies and it was set up to be a Mark and Execute playground.
I had no issues with hit detection, myself, and found it to be accurate. I've accidentally shot a guard in the head, trying to take out a light, too. This was because of the deviation of the bullet in flight, not because of hitbox issues.
Fun things to try:
Smash a guard's head into a door! (good example is the guard on the other side of the door on the right of the warehouse)
The shotgun is satisfying (M-500 Tactical, found on two soldiers in the demo, one being in the large open warehouse)
There are flashbangs on different tables/edges, and you can shoot them instead of picking them up. Very funny! (example: right behind the guy in the booth in the warehouse)
Take everyone in the level out with CQC (not hard at all, but pretty badass

)
Throw enemies into other enemies (while holding someone, forward + B)
... Yes, played it too many times.[/QUOTE]
The end of mission reports in Chaos Theory were essentially ratings reports.
Also, I'd want some firm and established rules for the AI before I go and play on Realistic (I probably never will if I get this.) Referring back to my example, it's very bothersome that the demo essentially asks you to jump in front of an enemy, but they still fail to see you because of this small piece of cover.
Again, I understand its a demo, but I do hope they fix those sorts of issues.
Also, is anyone else besides Gamestop offering a pre-order bonus? That silenced shotgun looks sick...