Oh my god man, according to Raptr I just played 5 hours of the ME3 demo!
Ok here's the thing, I've always never wanted multiplayer in Mass Effect. It doesn't need it because the single player experience and story is so good that you'll play the games multiple times thus lengthening the time of your game shelf life. However this horde mode with objectives gameplay is brilliant. Not only is this just a demo but there's tons to still unlock! I'm blown away with Bioware.
Played a few games with RBA Starblade and it was just insane. He pretty much maxed out charge and didn't carry a lot of weapons so he had an incredibly short cool down. At one point he was boxing Atlas mechs haha. We, had a full team btw, succeeded in a silver challenge and attempted the gold. Oh man Gold is rough, really rough.
I've already got three characters, 1)a Human male Adept specializing with Warp, 2)a Salarian male Infiltrator specializing with Energy Drain, and 3)a human male Soldier who only carries an assault rifle so he can continually concussive shot enemies.
There's a lot of depth behind this, and tactics for that matter, but there's also plenty of room for people to just run and gun with buddies.
Call me a fan of Mass Effect multiplayer, and I never thought I'd say that, and I've only played the demo.