This came to mind while I was playing the demo:

The gameplay was pretty good depsite the slightly annoying camera angles, and the graphics were alright.
However, for most of the demo I felt like I was just having names thrown at me with no explanation. There's a difference between expanding on back story and just throwing a list of fantasy-sounding words at the player with no explanation. And the bit that showed the villain laughing maniacally while sitting on a spiked throne in front of some lava or something didn't really help. It just seems like rather generic fantasy to me.
And after Mass Effect, it was kind of a shock to the system to the system to not hear your character's voice.
Still, it was rather enjoyable and I got a set of armour and a gun out of it for ME3, so all round it was pretty worthwhile.
One thing to note - you have to play for 45 minutes to unlock the gun. Reaching the main objective seems to cut that time short and end the demo before unlocking the gun.