As expected, it's more of what the first game is famous more, except with more stuff going on. I find myself being a lot more careful where I put forward my next step, and keeping more of an eye open for certain kinds of enemies exhibiting more sophisticated tactics, like throwing grenades and taking cover. I can see that a lot of minor visual details have been reworked for the better.
The only slight bit of criticism I can think of, is the lack of flexibility regarding the placement of item buttons on the sides of the screen. Being an iPad player, I tend to push my virtual joysticks up to the middle height of the screen, which now conflicts with these new buttons.