Probably the disagreement comes from how different people understand the ranking. If we're ranking them according to which one I'm most likely to buy, the ranking clearly goes Market>Survivors>three-way tie. But that's a pretty silly ranking, because I'm pretty much never buying Survivors, and I'm literally never buying the other three (except for name edge cases, in which case none of them has an advantage over the others). I think the goal of the Ruins ranking should be "If I could choose which Ruins to gain when I have to gain a Ruins, which one would I choose?". I don't think Ruined Library wins this competition, though maybe it's close. Really this is just another case of how much do you weight how good a card is in its best case vs. how good it is in the average case. Ruined Library is clearly the best in its best case, no questions there. But it's pretty bad in the average case, on par with the other ruins.