A few simple techniques on how to handle the SMGs in Halo2.
1. Pump the triggers every so often, alternate between left and right. This causes the recoil to drop somewhat if not entirely.
2. The melee is generally weak with dual SMGs, but if you pump enough lead into the target, you will not have to worry about the melee being strong enough to be effective.
3. Reload often. Keep maximum ammo spare. And remember... 'duallie' (2) SMGs is a strategic choice... you cannot throw grenades while wielding two but it is an effective move on vehicles.
4. Pack the battle rifle, max out the ammo for that as well.