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... Certification gain.
Let's not lie about it. You need to unlock expensive stuff to be competetive. It's a must on vehicles and prevalent in infantry. A Reaver/Mos/Scythe with just the main gun is fodder, a stock lightning is cardboard, even the heavy tanks are top of the red list if they're on the newb setup. The starter guns - at least for NC - are only acceptable for combat medic and heavy.
That would be no problem, you gotta level in every MMO.
The problem is...
There are millions of examples how XP gain and cert cost are ridiculously skewed at the moment.
Liberator belly gunner, combat zerg medic vs. teamplay infiltrator or pilot or engineer.
It's just ridiculous. I buy the aircraft, I upgrade the aircraft, I dump SC into it and the random a**hat that sits in my belly pot and clicks on moving black dots gets 1000XP per minute.
Infiltrator. Even worse. I enter a squad, go on vent, look for a not so contested base. Get into an overwatch position, sit there for 10 minutes scouting the area, killing - at best - two or three poor souls attempting to reach good positions, and the 250-500 XP for flipping a minor base. While as a combat medic, I connect, click on "deploy" at the reddest spot on the world map, run where most people are, and make 10000 XP in 10 minutes just by rezzing and healing the zerg dudes.
I know this will eventually die down when the zerg leaves the game.
Still. Just reduce incentive from killing stuff or rezzing stuff and increase rewards for flipping bases. And by increasing I mean 10000 XP for flipping a heavily contested Biolab, A thousand for converting a control point. And by reducing I mean 10 XP for killing some random dude somewhere.
EDIT: In fact, I only play CM atm just to be able to afford the stuff you need to actually be useful in vehicles or as any other class.