The most obvious problem with the current Political System mechanics is that it allows the whole OW system to become deliberately unbalanced and unfair, specially to the smaller nations, meaning in turn, that bigger nations tend to attract even more players. Nobody likes the idea of joining a nation which has no resources or ports.
Lets take the example of current PVP2 politics. We have basically 4 nations there. I don´t have the actual populations data, but using the port battles ratios as