Riot shield use..

The riot shield is quite the weapon if used correctly... and on the right map!
Whenever I use the riot shield I tend to use it only on maps that have narrow lanes or maps that have a lot of corners and minimal straights. Favela fits both descriptions perfectly but other maps such as Sub-base and Skidrow are also good maps to use the shield in.

The riot shield can deflect a lot of bullets, I mean a lot! It can deflect bullets from killstreaks such as Pavelows and Harriers, it also deflects explosions although for some reason, a semtex stuck to the shield will kill you instantly so be careful!

To use the shield to its maximum effectiveness, crouch and aim directly at the person shooting at you and begin to move forward towards him. Strafe when he strafes so you always have the shield pointed towards him. A shield requires two melee strikes so strike quickly! Same method applies for killstreak awards, crouch and aim your shield directly at the aircraft.

In terms of weapons and equipment as well as perks:
Secondary Weapon: A shotgun
Equipment: Throwing knife if wanted or semtex.

Perk 1: Marathon
Perk 2: Cold-Blooded
Perk 3: Commando

HAPPY BEATINGS!