Recently managed to finish Assassin's Creed IV: Black Flag. A damn good game that was, although the start was a slog to get through :/. I have noticed this trend in most open world games, at the start it is a pain to get through due to pacing issues and then it really gets going once your are decked out in good equipment (whether it be through story mission rewards or through grinding).
Also got my hands on the rest of the series on the PS3. Started playing AC 1, one can definitely tell they have come a LONG way from the first title. So many things in that game that just want to make you pull your hair out like no fast travel system (at least I haven't found one), or the fact that there are no subtitles and there are like at least 3-4 voices on screen at once in a busy market place. The sloppy controls don't help, but unlike Revelations, at least I'm not being flung around without warning lol.