Negatives:PC Demo: when paused the game and tried to reorder powers in Quick Slots, it crashed. It happens when i mouseover a power but it doesnt highlight it, when clicked it crashes. Not always, but often enough to annoy me, and the same goes to Mass Effect 2, there occurs randomly too.
Cover / running / rolling / activating is a little bit weird. It would be good, if rolling could be mapped to a different key. Sometimes it is difficult to come out of cover, or want to take cover and instead Shepard just keeps rolling. Or if can't be placed to an another key, an option to turn off rolling would be good too.
Running animations seem funny.
In ME1-2 camera movement, looking around, turning feels very natural, in ME3 demo it is strange. As if Shepard were on a moving boat, and it appears that the gun is leading/pulling Shepard when standing still and looking around, like i control the gun with the mouse, not the character itself.
Shepard, enemies, teammates and object seems much larger then previous games, maybe a fov issue. Almost everything seems closer to camera and bigger, no holstering weapon. I liked in ME1-2 when i put my weapon away and the camera jump even further from Shepard, so i could see even more. In the demo it is feels like camera attached to the wrong place.
Some power's descriptions seems vague, non informative. More dexterity?
Some dialogs are unskippable, mostly the longer ones.
Everything seems and feels to be more rushed and fast paced.
When out of ammo, it would be good to automatically switch to new weapon. Also an option would be good to auto-trigger "V" key, when there is a scene so i cant miss it, and i don't have to press it.
Sometimes i felt, oooh Mass Effect 3 finally, but sometimes: what is this, this is just an another shooter game, hope this changes in the final release. I'm hopeful.
Sounds are good, but sometimes one or two sounds just vanish, sometimes it is crackling, and not balanced.
Now the positive side:Cutscenes, lights, shadows, effects, hair-styles/textures, colors, eyes, faces etc. are superb. Voice acting i like. Main menu is very cool. GUI, menus look nice and react very well compare to ME2. Mouse scroll, double click support are great to be back. Overall animations are very good too, mainly in cutscenes, except one or two. The guns feels and hits very vell, except the sound issue. Powers are good too, only their descriptions are sometimes not. Loved that powers only level requirements, liked the powers new screen. Switchable helmets are very good options too. Overheat sound is back, and great as it was!! Revive teammate is good. Liked the cutscenes, and the pre rendered videos. And liked so much more.
Regarding story, dialog, upgrades, customization, powers cooldown: no comment, waiting for final release. I hope the fov, camera movement/behavior, sound issues are fixed in the final verison, and they are only the demo's "features". Can't wait to pick up weapons and mods and tweak them