I say it's balanced. Like if your repairing something like say a crane, any work done to it can't be taken off like a hack or HE objective. And HE charges just have to be defended for 40 seconds. Not hard at all. I usually play with friends instead of randoms (like 70% of the time) and so I find it balanced.

The cause of this problem is simple to identify:

The friendly AI doesn't give two [censored] about the Primary Objective. They spread out all over the Primary and Secondary Objective(s) whilst the enemy AI just gathers up around the Primary Objective and owns the [censored] out of the player due to superiour numbers.

So not only does the defenders have the advantage of a fortified position, but also numbers and generally higher IQ than the attackers.

Indeed, most of the balance complaints here are revolving around hacking instead. That can be taken away faster that you can produce it alone.

Because, some players are smart enough to defend that area, and AIs snap turn towards me the moment I get up there and kill me dead.