Okay so I've started playing MW2 again, and all I can say is I have missed this game, maybe not the noob-tubing and the modded lobbies, but overall this is the best COD in my opinion.

Anyway, my all time favourite game type on this game has to be "Search and Destroy" closely followed by "Demolition".
My average score on S&D is usually around 7-15 kills with as little as 0 deaths to maybe a maximum of 4. That's not saying that I haven't gone 0-7, we've all had those games where we just can't seem to do anything right (even if you won't admit it)

My best tactic that I mostly deploy on S&D is shown below:

Attacking Team:

Primary: UMP45 w/ Silencer
Secondary: G18 w/ Akimbo
Perk 1: Marathon
Perk 2: Cold-Blooded
Perk 3: Ninja (This is a must in my opinion)

Now, on attack if I manage to grab the bomb before my team mates I like to do a rush to one bomb site (usually the closest one). Once I have rushed to this bomb I either:
a) Plant the bomb straight away.
b) Wait for 5-10 seconds (no longer) to kill whoever unfortunately decided to try defend this bomb. If no one arrives in this time I obviously plant.

If I don't manage to grab the bomb before my team mates, I will rush to the enemy spawn around the edge of the map and catch them off guard.

Defending Team:
Primary: ACR w/ Holographic Sight
Secondary: Spas 12 w/ Grip
Perk 1: Marathon
Perk 2: Stopping Power
Perk 3: Ninja (This is a must in my opinion)

On Defence I like to run to the middle area of the map, wait for a couple of rushers, if any, and kill these before they know what's happened to them. Once I think "mid map" is clear I will make my way to one of the bomb sites that is closest to me and watch for attackers that are playing cautiously trying to plant. then it is left to my team mates to kill the stragglers.

I do occasionally rush on defence but only if I'm sure that the other team is not going to be able to do much and my team is decent enough to hold there own.

Killstreaks:
The only killstreaks I use on S&D and the main reason I think I get good scores is because I use:
3 Killstreak: UAV
4 Killstreak: Counter UAV
5 Killstreak: Predator Missile

These are the easiest to get on Search and Destroy and help you to stay alive for longer and find kills easier.

My Search and Destroy tips:

Defence:

When you kill, check to see if the bomb has been dropped then defend this area if it has

DO NOT CAMP IN SPAWN

If the enemy plants the bomb, please try and do your best to clear the area and defuse

Don't chase kills, wait for them to come to you (trust me this works 90% of the time)

Attacking:

DO NOT PICK UP THE BOMB IF YOUR NOT GOING TO PLANT IT

DO NOT RUSH INTO THE ENEMY SPAWN WITH THE BOMB

Leave enough time to plant the bomb if you cant find someone to kill to win the round

All round game:

Use your stuns when in tricky situations, you have them for a reason

Play the objective

Look out for my gamertag in games, I'm probably at the top of the leaderboards: I Am Jordan G