Played through the demo twice yesterday, pretty kickass. It only runs a smidge worse than ME2 on my ancient Radeon HD3450, so it's good that I can actually play the current PC game I most care about.
The background details when you stop to look out at the earth city are awesome. I especially like the reaper ship and warship that shoot back and forth at each other perpetually, until you reach the trigger point and the warship blows up. The addition of cinematic zazz definitely seems successful.
My 2nd try was with MaleShep, the first time I've ever messed with him in the series. Judging from just the few scenes in the demo, I don't think I need to bother with him for a whole game. The FemShep actress is just so much better at involving me in what's going on.
I'm not sure if it's just because I haven't played it in 2 years, but the shooting action in the 2nd half seemed better than ME2 , more fun. I'll have to load ME2 back up and compare.
I'm pretty sick of spending all my time Warping and Singularitying from a distance as an Adept in ME2, I'm ready to bring the incindeary ammo death.
A question: I'm not too familiar with the whole Gear Of War cover control thing, but is there a way to run into a low ridge and just hop over it and keep going? Every way I've tried, it seems like you have to crouch down in cover against the ridge first, and then hit forward+space to hop over it. That seems really stupid.