Is it just the PC folk having trouble?
Because I downloaded it for 360 a couple of hours ago, and just finished it.
It was fun, there is a LITTLE tie into the main story (but not much), lack of speech stands out, and I think the Hammerhead needs a health bar. There is a 10% Biotic Damage research boost though, so that's cool, and I guess for Biotic players is like the soldier getting an extra gun download.
I also had another system show up in the Krogan DMZ cluster, but with no missions or anything. I never saw it before, so I'm pretty sure it was with this download. Or possibly the update from XBL that came through earlier. Whatever, I'm sure Planet Scanners will love it.
Also, why does it seem like the Hammerhead can fly in cutscenes (boarding the Normandy) but when I'm controlling it, I'm not flying, I'm just falling with style?