Re: OP's grammar -
Yeah, it was pretty atrocious in places, but by now I think we can put down the club; anything further would just be an exercise in equine sado-necro-bestiality. Basic takeaway: put a bit of effort into making your post as clear as possible when starting a topic, and all concerned will be happier for it.
Re: Rushing complaints -
Your complaint about rushing seems to boil down to "I found a really comfy hiding spot, but this guy with the shotty killed me anyway; I don't like that!" While I can sympathize with you somewhat?sniper is one of my favorite roles, after all?rushing in with a short-ranged weapon is one of the few successful ways to eliminate an entrenched sniper, along with counter-sniping and flushing the sniper out with a well-placed grenade.
If you don't like getting rushed in a camping spot then...don't camp! Being a skilled sniper is at least as much about knowing when to move on as it is being able to perforate the skull of a spastic gun-bunny. Scout out all the sniping nests, and learn the most protected routes between them. Practice moving from one to another quickly, and get in the habit of doing so after 2-3 shots fired, whether you hit or not. Once you master the knack, I guarantee your success as a long-distance head-cheese ventilator will improve dramatically.
RE: FPS annoyances -
I'm doubtless going to be repeating some of what has been said here already, but I might as well add in my $0.02 after going this far. So, Things Wot Get On My Tits About Camera-In-The-Head Shooty Games:
*Shepherd missions: I would call them Escort missions, but 'escort' implies that the person you're supposed to be protecting knows where they're going, who's likely to try stopping them, and how to Not Get Shot. More often, these missions feel like herding an especially dumb and aggro breed of sheep, whose natural instinct at the first sign of trouble is not to flee, but to run towards the aforementioned Lead Sammich like a starving Ethiopian kid towards an all-you-can eat buffet. This is stupid, and moreover it is not a way in which real people are stupid (often). If you want to include such a character, then either make them durable enough to survive being shot in the head a few times, or give the player the option to let them die and continue on with the game.
*Taking One For The (other) Team: Most often encountered in FPS games designed for co-op, AI-controlled NPCs often have the inexplicable urge to dance back and forth in front of your point of aim during an intense fire fight, even when you've been sending a pretty much continuous stream of lethal and highly visible projectiles downrange. Players will do this too on occasion, but politely asking them to watch lanes of fire will usually do the trick after one or two mishaps. (Unless you're teamed with a Leeroy, in which case there's no hope for them anyway.) AI-controlled Survivors in L4D are particularly bad about this, and will have the added gall to complain about being shot, as if it's your fault they leapt in between you and an Infected. *facepalm*
*Invisible Walls: Slapping down invisible walls everywhere to funnel me into a pre-defined path is lazy and stupid, and every last ghostly one of them is a huge immersion-breaker. Game designers who use these, and then prattle on about the 'incredible realism' in their game need to be beaten upside the head with a bag of carrots, because they are obviously blind. Three slaps for every pile of ankle-high rubble I can't scramble over should drive the point home.
*Magic One-Inch Ledge: Perhaps the opposite of Invisible Walls, the Magic One-Inch Ledge is a tiny bit of architecture jutting out from somewhere, usually high up, that allows a player skilled with rocket/grenade jumping to utilize a camping spot where none should be possible. I realize that the mechanics of hitboxes make it impractical to determine exactly how wide a ledge needs to be to support a player, but when you're building a multiplayer arena from scratch, you have full control over how everything is placed. Going over the map a time or two to check for this surely couldn't hurt, and it will prevent silly crap like this.
There are others, of course, but these crop up often enough to graduate from irritation to actual problem.