Well, some of those are a bit nitpicky. For instance, your foes are probably throwing your grenades back at you because you're chucking them as soon as you pull the pin - hold the button down to hold on to the grenade for a few seconds, then chuck it into a room. This gives them less time to run and they'll rarely ever be able to throw it back.
Also, the expanding crosshairs is meant to indicate decreased accuracy due to recoil - this isn't a bug at all.
Granted, though - the rest of those are things I noticed as well.
My one main pet peeve with the gameplay itself is that the sniper rifle and the sniper function on the OICW are very rarely used, since most enemies don't spawn until you're close enough to make a rifle or shotgun your only option. I used the Sniper a couple of times, to lean around corners at somewhat distant enemies, but I found that the assault rifle on Burst mode was almost as accurate at medium distances and was a lot safer, since most of the time, if you could see the enemy, they could also see you. So I would've liked to see a couple of levels where you could pick off enemies from a distance.
I guess, while I'm bitching, I should reiterate my displeasure with the way the computer could fire at you without you being able to see them. Not only through walls, trucks, etc., but through the tall grass, sheets in the hospital, and most annoyingly, the smoke grenades.
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This comment was edited on May 31, 00:49.