Modern Warfare 2 is a Call of Duty game that includes premade loadouts for players to use, but there is also the possibility to create a custom class. This allows players to build a class that suits their playstyle, using all of the weapons, bonuses, and tactical equipment.
Creating a Custom Class in Modern Warfare 2
When you click the + icon, you'll see a row of options along the top: Play, Weapons, Operators, and Store. Select Weapons to be brought to the main menu. For Multiplayer Loadout, killstreaks, and vehicle customization, click the + icon. For a custom class, players may select their primary and secondary weapons, tactical and deadly equipment, perk package, and field upgrade.
There is no greater way to play than with a custom class. It's custom-tailored to them and becomes even more valuable as players unlock additional features, bonuses, and other stuff. While you're at it, maybe test drive the M4.