Here are some tactics you guys might want to try...
What you need
-Assault Class (so you can resupply yourself with C4): Shotgun, C4, Extra Explosives Ammo, Extra Explosives Power
-Two or more friends with the same class
How to Win
Basically you need to sprint into an objective and lay down all your C4 on the MCOM station, then if you have time run away and blow it up, if you don't have time just blow it up and suicide. You need about 12 C4's to be placed on the station to kill it in one go, the best part is even if you die a stray bullet from any team can still kill the MCOM station. You might fail a few times, but all you need is a small window of opportunity and you will score an objective kill, and you get more points doing it this way, as you get a bonus for objective damage too.
Suicide vehicles
Kind of similar to the other strategy, but this time you only need to reach the objective for an instant win. Basically load up a quad bike with C4, then have a guy on the back with the detonater, drive into the MCOM station and suicide on it. This time you need around 24 C4's to kill it in one go, which usually means 2 runs, but quad bikes spawn quickly. If you're really organised you can do the same with a UAV. Load it up with C4 and land on an objective, the enemy will be so happy shooting you they won't realise they just killed their own objective by shooting the C4. Or you can wait for the guy with the detonater to hide within range, then he can detonate the C4, damaging the objective but not the UAV.