Normal difficulty. The same way I play every other game.
Pertaining to your "wanting the same game" comments, I'd have to disagree with you on the generalization that you made. Its not like its asking a lot for a sequel to be similar to its predecessor. Of course I don't want a huge expansion, and if you'd read what I said above, you'd see that. But I'm not complaining that a game is bad because its not like some other completely unrelated game. Its a sequel. The specifics are the things that matter when creating a sequel. A few changes may not make a huge difference, but when you get into changing many things that made the original so great, then it starts to become a completely different game. I'm also aware, (and I've said this of many other sequels,) that the original is still there, and I can always play that. The reason I'm disappointed is just that, though. I was extremely into the first one, and I was very excited for the second.
I wanted to avoid the sub-argument that Bioware's games are getting more and more simplified, but I have a feeling that it won't be long before that comes up. Therefore, I'll just do it now. I'll also come out and say that I don't like Mass Effect. I've tried to play through the first one a few times, but I always get to the Citadel, play a bit more, and then get bored. I don't want this to turn into a Mass Effect discussion, like Strike said before, but I say this to provide insight into my waning interest in Bioware games.
Edit for your edit: Differing opinions don't mean that it doesn't warrant discussion. Just because you like something that I don't, or vice-versa, doesn't mean I don't like you or something. That would be ridiculous.