First of all, the game is a very good game in my opinion and is not a crappy console port I first thought it would turn out to be.
-As many mentioned, sometimes the server won't load probably
-My rank gets a reset randomly
-I have to unlock attachments several times before I can really use them
-The server browser won't save my settings
-Sometimes you can't use a melee attack after you zoomed in with your gun
-When you run out of ammo and want to quickly switch to your sidearm, the reload-animation of the primary gun is still playing (very quickly), therefore it takes ages to take out the sidearm
-The Scar standard rifle is way too overpowered, it has almost no recoil, therefore you can go full throttle and still hit very precisely
-The Assault mode (classic aswell) where you run around as normal soldiers is quite lame. Especially the fact that the normal soldiers can only sprint for like 2 seconds, which is ridiculous.
-The standard sniper rifle is also quite overpowered. It is a semi-automatic gun and does way too much damage.
-The grenade/gauss/shotgun attachments are quite useless, you only have one grenade which does almost no area damage at all, the gauss attachment is too weak regarding the fact that it has only 2 shots and a very long reload time
-The firing speed of the Hammer pistol makes it pretty useless, the M12 is way better because you can fire with it like it is a submachine gun. The balancing between those two guns is ridiculous.
-Stealth kills do not always work, plus it may be cool to kill someone who is cloaked aswell with a stealth kill (didn't work for me so far)
-Sometimes I have the feeling my bullets disappear in the Neverland, I guess it is because of some lags?
-Opening so many ports to have an open NAT type is ridiculous, every other fps shooter I know doesn't require that
-The quick match options is pretty bad, I am always thrown into empty servers
-Random disconnects from servers, at first I thought it was always just me, but then I played with a friend and it happened to him at the exact same time as to me
Hmm that's all I can think of now, I'll update if I find some more stuff.
Keep it up Crytek, all beginnings are difficult, looking forward to a relieving patch soon!