Well, everyone doesn't like that no matter for how long turrets are out there and no matter how long they shoot, they will never stop... How about making the turrets overheat if fired for too long, Im not talking about anything as fast as a tank but, that a decent tank assult can be repeled no problem but if the enemy quickly manages to get some new armor and infantry up there the turrets will overheat giving the attacking team a chance against the turret spamming team (Even the turret spammers will have some tanks and Panzershreks)
If you increase turrets rate of fire or give them knockback... Otherwise there would be lame strategies like engy healing a "human-shield" teammate to wait the turrets were overheated...
Good idea, use cannon-fodder to overheat turrets respawning from a nearby APC, then rush them whith enjies to deconsruct them, while everyone else kills the base! Oh and I like the sounds of healing a Grenadeir while he shoots turrets, and yes, I'm a repentant turret spamer.