For the past couple of weeks, since this games release, one subject has been beat like a dead horse over and over again.
Siege Frigates
Spammable, dispensible, low tech, practically insta-gib planets without at least a heavy amount of defensive structures + defensive fleet in-system or a max of 1 jump away.
Shields help mitigate damage and the other defensive structures help destroy the frigates themselves. Emergency facilities absorb large amounts damage, but it is still not enough to stop these ships even on fully developed planets with maxed out tactical structures. In comes a new idea.
Require siege frigates to DEPLOY themselves, taking anywhere from 30 seconds to maybe a minute at the range they need to bombard from.
You know what this does? This puts the SIEGE part of their name into effect. Siege weaponry is not a quick strike force, never was, for the simple fact that it requires large amounts of mass being through/pushed/crashed/launched at heavy defenses. To do this, a siege engine has to be deployed in order for itself not to fire completely inaccurately all over the place.
I'm pretty sure that on a small ship like a siege frigate, all their equipment would NOT be completely stable. Would you want to handle a 100Megaton warhead while your ship is moving about? I don't think so! So yeah, there be my idea, doesn't look terribly difficult to implement with the current system so what'dya think?