i would only build GL if i have an obvious production start (or i'm babylon and researching writing asap anyway).. like others i rarely research writing early enough to try.. if i build it i would never pick something like iron working.. i pick philosophy to sling shot national college.. this really gets your science rocking and sets you up for any victory..
iron working will essentially gimp you.. lets say you really rush iron working via GL.. now you've already forgone valuable buildings to get the GL up asap.. the next thing you build are swordsmen? what about granary shrine water mill or more workers or caravans or settlers or archers.. it would be better (imo) to get the NC up asap and research IW while you catch your city up with what its been missing for the past 20 odd turns..
even better is to skip IW altogether and focus on getting to civil service.. pikes > swordsmen.. plus you get more food.. markets.. horses... then your two techs away from education.
iron working will essentially gimp you.. lets say you really rush iron working via GL.. now you've already forgone valuable buildings to get the GL up asap.. the next thing you build are swordsmen? what about granary shrine water mill or more workers or caravans or settlers or archers.. it would be better (imo) to get the NC up asap and research IW while you catch your city up with what its been missing for the past 20 odd turns..
even better is to skip IW altogether and focus on getting to civil service.. pikes > swordsmen.. plus you get more food.. markets.. horses... then your two techs away from education.