(Disclaimer : Yes, a lot of this is like common sense, but I'm going to say it anyways.)
As we had kind of gone over in the other thread, politics is an easy filler usually for creating easy hooks/reasons for people to get involved or for you get other people involved, but (again) that of course with all of its own drama/problems/extra work for staff/etc.
Though, even on games with political stuff ongoing, that can be difficult to get into if there's not actually any room for change/fluidity to the system. Knowing nothing is going to change because staff doesn't want to deal with a change in the setting's power structure, or because a certain player/clique has a deathgrip, or whatever the reason might be, takes some of the fun out of plotting.
Of course the more sandboxy games tend to be where people would have difficulty getting involved.in stuff, but one thing I'm guilty of myself and I see people do all the time, is going into a game like that and making something that has very little reason to be involved with the characters who already exist, and then finding they don't have much to do with the character and moving on to other games because they think that one is boring or making a new char.
If you show up somewhere and +census says there's 5+ of faction X and faction Y and only 1 member of faction Z, you might want to rethink making your character for faction Z unless you're the sort who can get your own ball rolling (or are apping in with friends).
If you're not the make-your-own-fun sort, do yourself (and the game a favor) and app into something with an active faction, or something with leanings towards the faction. Usually, people will gladly welcome you and try to get you involved. Find somebody who has a listing on the wanted board and talk to them about coming in with some connections.