i'll play with you guys when you're man enough to allow assault class
they're part of killzone 2 and they are balanced. banning them will just prevent you from learning how to properly counter them or use them. i don't even play the assault class, but playing in a game where they aren't allowed just makes the whole thing feel off. tacticians are the true enablers of chaos and spam anyway (as we saw, plainly, in the game at Radec Academy seek and destroy mission). people spawn in the middle of the room with the objective, throw their frag grenades, and shoot at whatever moves until they die and repeat.
edit:
to clarify: i DO NOT want to ban tacticians. i think it's silly to ban anything. this game can be chaotic when opposing spawn grenades are close, but it's a very balanced game.
to reduce spam/chaos/clusterfuck, i still think spawn grenades should be treated like capture and hold items -- as in, if you stand by an enemy spawn grenade, it prevents them from spawning there. and if you stand on it long enough, it will disappear. but unlike capture and hold objectives, if no enemy is nearby, it should recharge itself to full.