Are the gun shots supposed to sound pretty flat and quite?
Somewhat. The rifles never had super-"cracky" gunshot sounds to start with, and the machineguns were always very rat-a-tat-tat. If you're looking for BOOMING GUN NOISES, this isn't your game.
The only real sound issue I'm having is still vocalizations on the attack; it still sounds like sound position isn't being calculated properly, and most tellingly, some speech off-camera also sounds a little "echoey" and not exactly correct. I am set for 48k and Stereo, so I do think the software mixing on the sound is a little off still.
It's another thing that should be eminently patchable, though, and it's a very minor thing and only affects voice. 95% of the time, everything is cool. Still loving this port and playing this game the way it was always meant to be played.
Ah, so no difficulty option. Means I'll reach a point where I have to switch to Let's Play videos as I'm uniformly crap at strategy, but I'll enjoy the ride until then.
The basic difficulty for the story missions is generally not high, especially if you aren't chasing after an A rank for every single story mission. I wouldn't worry too much.