I always hoped for an update for the ruins...I do not think that anybody likes ruins with barb infos or maps. For balancing them I hoped for sth. like a choice what you get or do there, a little bit like the random events in Civ 4.
In Civ 2 or 3 it was even harder, you could get settlers or cities...
I agree that because the competion is to achieve things faster then the other players the ruins benefits are to different to call them balanced. My first warrior in the hun-game changed to a battering ram in my first ruin, that was not the best reward for that point of the game...
On the other hand we will never have the very same conditions, I replayed several games to try to see what I have could done better and found a complete different situation, AI players that were strong before were killed and so on.
And the difference between what missions you get from the city-states is as influencing then the ruins. When I get a mission that I have already nearly solved it is a big difference compared to sth I can not solve.
I sometimes had lucky combinations, one mission was easy to fulfill, I recieved horses for example from the new ally and another city-state asked for horses. And in conclusion I will get the same advantages as in the ruins that way: culture, units, faith, growth...
Concerning the ruins I would say when we ask statistics two players finding 5 ruins will have nearly the same advantage then other players who found 5 ruins. So we are back in balanced strategy, because players who decide to build scouts and move them clever can achieve this advantage in the same equitable way.
I like the idea of GOTM, but we have to see that playing really the very same game and only playing style is the factor that makes the difference is an illusion.
So after all that considerations I would vote to keep them.
It always will be a game, the first choice to go North or South is most of the time not a decision that you make because of brillant strategic thinking, and even this desicion could decide if you end the game 20 turn ealier, because you find a special city state or a very good settling location first.