what is your best classes used for ModernWarefare2?

Try this:

Primary: UMP45

- Attachment: Silencer

Secondary: RPG-7

Equipment: Semtex or C4

Special: Your personal preference. I like stun, but its up to you.

Perk 1: Marathon

Perk 2 Cold-Blooded

Perk 3: Sitrep

Deathstreak: I use Copycat, just because I think all deathstreaks are total bullcrap, and I get mad when other people use them, so...)

This is the ULTIMATE camper killing class. I highly suggest trying it out.

NOTE: It also is amazing for finding/stopping boosters in FFA.

Really depends on the map, Here are 2 of my primary classes:

#1 Primary: Ump45 with silencer

Secondary: Spas 12 Foregrip (beast gun)

Semtex

Marathon pro

leightweight pro

Ninja Pro

Second Class:

Tar 21 Extended Mags

AA12 Foregrip

Claymore

Scavenger Pro

Stoping Power Pro

Ninja Pro

Anti Air:

AK-47

Stinger Missle (get two missles and can shoot down AC-130's, UAV, and Jammers)

Scavenger (get more missles)

Cold-Blooded

Sitrep

Basic Class:

M16 w/ holographic

RPG

Sleight of Hand

Stopping Power

Commando

Close Quarters:

UMP45 w/ rapid fire

G18 dual wield

Sleight of Hand

Stopping Power

Commando

MLC (Knifing class)

Ump45 silenced

Pp2000 silenced

Scavenger pro

Cold blooded pro

Ninja pro

If you want best just use the UMP/Akimbo Rafficas Semtex with marathon/lightweight or cold blooded/free perk?