Most bases are TOO defensible. Even Neo funnels players through a chockepoint that is easily defended by no more than two BAR users.
The two biggest problems are
1. Most bases have a short way to the flag right through the front door, and a long way that when used is easily predicted. There is no alternative to rushing in and getting gunned down.
2. Healing staffs. God forsaken, OPAF healing staffs. It only takes one to fortify a small group of players into an immovable object.
Please, just... Do SOMETHING.