Camping is a strategy, just like running in guns blazing is a strategy. Each one has their own benefits and downsides, and should both be looked at as viable options, depending on the situation.
Sniper rifles are, let's face it, camping weapons. They're powerful, but you have to line up a headshot, and that isn't easy to do while moving. Even in Halo, a standing sniper is probably more accurate than a running one, so there is no point in whining about it. The same applies to many other weapons.
The key is knowing when to use each strategy. If you stand over in a corner the whole game, then everyone is going to know where you are, and you'll have to deal with bullets and grenades flying your way after a short while. Similarly, if you charge straight into battle the whole game, you're going to start eating bullets like there is no tomorrow. Sometimes, you just have to hold back and wait for them to come to you, and sometimes you have to go to them. That's just the way it works.
Sniper rifles are, let's face it, camping weapons. They're powerful, but you have to line up a headshot, and that isn't easy to do while moving. Even in Halo, a standing sniper is probably more accurate than a running one, so there is no point in whining about it. The same applies to many other weapons.
The key is knowing when to use each strategy. If you stand over in a corner the whole game, then everyone is going to know where you are, and you'll have to deal with bullets and grenades flying your way after a short while. Similarly, if you charge straight into battle the whole game, you're going to start eating bullets like there is no tomorrow. Sometimes, you just have to hold back and wait for them to come to you, and sometimes you have to go to them. That's just the way it works.