Ah, but I think most enemies still have only one - or no - protections.
I have to agree with the complaints about the cover system. Sometimes using a skill got me out of cover and torn to shreds by enemies, and there seems to be a "gap" in between the distance Shepard needs to be to slide to cover or just stick to it immediately, meaning you'll be pressing that cover button like crazy without any results.
Still, it's really fun, especially when you start getting creative with the powers and combos.