I actually hate the idea of "rolling". Sadly, I've done this currently on only TWO occassions, when I was playing Gandhi, I just never got comfortable enough with my game, seeing as I was going for Diplomatic Victory (Vanilla). I can't get the feeling as to why it was the happiness that really seemed to cause it.. so , I don't know.
And recently as Boudicca, primarily because I was completely unsure as to how to play her, ended up giving her a Culture Victory, as I realised her ability and unique items are rather "Culture" oriented. Happily, I killed two stones with one bird (please don't laugh, I'm aware of the error I made) and conquered the whole continent before Runaway Washington annhilated me on Warlord :| stupid Continents Plus -.-, so much Jungle.