I also don't like the fact that you can't remove the helmets from the DLC armors. It's definitely going to reduce the chances of me using them in the game since I won't be able to see Shepard's face. They should have done what they did with Dragon Age: have the characters don the helmets during gameplay and select cutscenes, but remove them during any and all interactions.
Speaking of Shepard's face, I didn't like how my ME1 Shepard looked when porting her over to ME2. I mean, she looked the same, but there was something off about her - her cheeks seemed sunken in, but it was probably due to the facial template I used in ME1. I ended up playing about an hour before deciding to start over and redo her face, tweaking it so she still looked like my character while fixing the little details that were bothering me. Sucks, because I probably spent an extra 45 minutes just obsessing over that.
She's looking much better now, but the one thing I regret is that my ME1 character (and the port) has SUPER bright green eyes which I loved, but ME2 didn't have that same bright color