Okay, this next part will be a little less official and focus on a few things: Differences between PC and PS3, specific things about the multiplayer experience, and some observations about the singleplayer portion.
One of the odd things is that while Singleplayer handled better on PC than PS3, the multiplayer genuinely feels better on PS3 than PC. This isn't to say PC is crap or anything, but it's clear the MP was being designed for consoles. The PS3 does have slightly fewer FPS, slightly longer load times, and some odd changes to the UI (granted there's one little thing in the UI that I am confounded they didn't include in the PC version). The PC version isn't just a port or anything, the controls just feel a little bit more spread out unnecessarily. Oddly, tactical mode is available (although it doesn't freeze time) in MP on PC, yet not on PS3, even though the PC has more open hot keys. Besides that, there's not really any notable difference
Now, to the multiplayer. Some classes feel perfectly balanced, like the Quarian Engineer, the Human Vanguard, or the Salarian Infiltrator. However, others seem just plopped in as quickly as possible, such as the Human Soldier. I've yet to see a Krogan or Turian unlocked yet in the multiplayer, and only once saw an Asari in play. The fact is that everyone can work within the means of their abilities, but some ability sets are a lot more versatile. Human Vanguards, with fast regen and little to no weapons, can clobber enemies just with biotics. A Quarian Engineer has access to both Cryo and Incinerate abilities, and there's even a 6th tier upgrade for Incinerate that makes it deal 100% more damage if you use Cryo. Meanwhile, the soldier just has Adrenaline (which now just gives a damage boost in MP), Impact Shot, and Frag Grenade. Now I will admit a soldier can be handy (they can take down an Atlas within a minute if they regen their powers fast enough), but it feels like they just assigned the powers without really fleshing them out. This is just my opinion, so don't let that stop you from trying the soldier class if that's your plan.
Also on the multiplayer note is the combat AI. I realize that Bioware isn't Monolith (the sheer fact we've been waiting this long for Mass Effect to feel like a fun shooter experience is testament to it all), but I actually only see slight improvement in the game's AI over Mass Effect 2 (i.e. they do more than just either suicidally throw a krogan at you or hop up and down from behind cover). The sniper enemy AI is incredibly dumb, not able to comprehend how to fight in any sort of close-quarters fashion. The ninja enemy type feels way too over powered considering more than one of them can spawn at the same time. The Atlas also feels sometimes unbalanced depending on what classes you've got in your squad. The general feel is that the AI finally can handle basic combat, but I bet even TF2 bots could do a better job than the ME3 AI. At least they've got the advantage of large numbers in most waves, and the combat engineers actually make the most sense (and are the most strategically challenging enemy when they've got a sentry turret setup).
Last I wanted to make this small note: was it just me or did Mordin and/or Wrex seem to have a different voice actor and/or personality than they did in ME2?
