I think the POB siege itself is fine, the issue comes in to the grinding aspect of taking down a playerbase. It isn't all that interesting to do by itself and whichever side can commit to grinding it down more (still preferably with battleships) is more likely to be successful. Even with the CR group that rallied together today brought Basilica down from 79% to 60% but there was less capability to blockade Outcasts and keep them off Helios / commit to grinding down Basilica.
I kind of like the duration of it, 3-4 days, but the grinding / heavy battleship-favored portion of it needs to be taken out.