Relax.

When ME1 and ME2 demo first came out on the Xbox 360, it was the same problem.
Framerate issues.
When ME2 demo came out for the PS3, again.. same issues, framerates and low-res textures.

Same goes for most of other Bioware games too, more often than not their final product is always better than the demo.
Unlike many other games, a demo does represent the final version often times.

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Added on February 16, 2012, 6:40 pmAs for the comparison on the demos, the PS3 version is Vsync where as the 360 version isn't.
Screen tearing is apparent on the 360.
Though fortunately it isn't too bad.

SSAO is also more pronounced on the 360, making the textures pop more. But does make shadows look jagged.
The PS3 version has soft-shadow enabled.

yeah bloody excited, i think mass effect 2 will be one of the few ps3 games i wont be selling, just to play around with the story in the next game, ME1 came out for ps3 only as digital? or got retail copies also?

So you did bought it? I always wonder how much PS+ full game trial contribute to the sales.

aiya just now i play with you 2 person only also no problem mahhh... kao tim also 

guys, the me3 storyline is tied to me1 and me2? 

I saw Captain Kirrahe on demo and i thought he was dead on me1 during mission at virmire..how he survive eh? 

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if u played me1 of course u can save him.lol

Phantom:

for a Soldier you probably need a teammate with powers to take out her barrier, you job at the early stage is to spam fire her with the assault rifle bullet, once your teammate is able to warp/overload away her barrier, she will try to cloak and run away to recharge her barrier, at this time, keep spamming her with bullet(else she will go completely invisible if not interrupted by bullet), once she find her hiding spot and take cover, switch to your sniper rifle. The Phantom takes cover in a very odd posture that makes her head pop out. Finish her with a headshot.

If you are a Krogan Soldier, and she is running towards you, just Krogan Charge her.
Nemesis:

The main problem is she tends to run away when you get close,
When you have her at mid to close quarter, try to get a concussive shot off to stagger her, and take the chance to fire at her. Again, a teammate that can quickly take out her shield helps.

in demo no MP mode for players vs players? what i found is players vs cpu

So the way it works is that there are two systems, one is Readiness which is a percentage and the other is your Galaxy at War score.  Both combined give you a number that calculates along with your choices what ending you get.  You need a score of 3750 to get the Master and Commander achievement and a minimum score of 4000 to get the best ending.  Now your Readiness percentage starts at 50% which is not affected by playing the single-player.  50% seems to be the absolute base in that it can't go below that and multiplayer makes end game much easier.  Readiness can only be affected by playing the multiplayer.  So to get the perfect ending, you have to get a GAW score in single-player of 8000 and have certain correct choices.  In order to negate these choices you have to get a end game GAW score of 10,000 (or 5,000 once you calculate in Readiness).  The bad news is that there is a decay system attached to Readiness which is linked to real-life time.  However note that Readiness cannot go below 50% and is so the decay will only affect the bonus from multiplayer.  Something like 1% a day.

What this means in regards to the endings is that to get the perfect ending, you have to play through the singleplayer game and do EVERY sidemission to get the perfect ending.  Now you can do multiplayer so you have to do less sidemissions but that bonus will decay in real-time.  You can take your time but you'll have to play the multiplayer or the iOS game to maintain or increase your readiness bonus percentage.

So the multiplayer makes getting the perfect game MUCH easier.  It is however doable in singleplayer only.  Also when you import your level 20 character you get a GAW score of 75.

And yes the decay system is a horrible idea and I hate the person who thought it up.

Source is a guy who has played a build of the complete game.  Check spoiler group for more details.

Again it is possible to get a perfect ending without the multiplayer but it is much harder.

Formula:

Overall score = GaW x GR.

GaW is affected by SP and doesn't decay over time.

GR is affected by MP and decays 1% every day if it is above 50%. If you don't play MP at all, it is always at 50%.

Great. Just hope that the side missions are not too hidden away or missable.

I just  tested me3 demo campaign mode. I never played previous ME before.. But im curious what you guys choose to play on campaign mode? Role playing or action? Is role playing harder? Because i only tried action.
The demo version had alot of screen tearings and frame rate problems. I hope its not like this in the final build..