Okay let's see:
Asura's wrath:
It was kind of good, A bit too fast and too simple, but good.
Not to mention the horrible lip syncing.
Final Fantasy XIII-2:
I hate RPGs. I quit the demo after 2 minutes.
Kingdoms of Amalur: Reckoning:
Again, I hate RPGs. Although I did play this demo a little longer and liked it alot at first.
The Darkness II:
It was awesome. The gameplay was tight and brutal. The graphics were great. The voice acting was brilliant and it seemed like they made every character memorable.
Syndicate:
Quite good actually, movement seems a bit clunky but i liked it... not enough to make me buy it though.
Mass Effect 3:
LAAAAAAAAAAAAAAAAAME. I don't understand why this game gets so much praise! The shooting mechanics are mediocre, the voice acting is mediocre, A story about alien monsters that want to destroy humans? and HORRIBLE cutscenes with HORRIBLE face expressions.
What is there to like? I mean seriously, I want someone to convince me.
Needless to say, I didn't finish the demo. Just like I did with the ME2 demo.
Binary Domain:
This one the other hand was MUCH better, Good shooting mechanics, The way robots receive damage is genius: having multiple layers of metal and getting broken apart and all that.
With a story that - for me - seems much more interesting than big evil aliens.
SSX:
Now this one's a surprise! I enjoyed beating other people's laps. I don't know why

maybe it's because i can see their ghosts. Great tight controls and fun trick system. I beat mjk!
Fifa Street:
Just as good as a regular FIFA game! Fast paced gameplay, GREAT crowd and commentator feedback! Hearing everyone cheers puts a smile on my face every time! I even laugh out loud sometimes.
Great trick system: Easy to play, hard to master.
And there you go, the most amazing - and most useful - demo report you will ever need to read!
NOT