Yeah, Walled Village being this low is completely absurd. The differences between the villages are mostly very small. I think I had them all (except Wandering Minstrel and maybe one other?) between #30 and #20. The fact that its extra bonus is not as nice as say Worker's Village's extra bonus is not enough to justify a difference in 20+ rankings (guessing Worker's Village will be way up there).
Rats seems too low to me. While it does need support in order to not be completely useless (and even harmful), it finds that support reasonably often, and in many cases it's just completely bonkers (Apprentice, Bishop, Upgrade, Watchtower). Also, I would speculate that some of the tokens from Adventures make it even more nuts (though I have not tried this myself).
Nomad Camp is way too high. Like Woodcutter, the only real appeal to it is that it's +buy and maybe it's the only +buy card on the board. Every now and then, you can do something clever with the on-gain ability, but it's only a very slight benefit, and I'm not sure it even justifies the $4 cost. No way it's better than Rats, and I have trouble believing it's better than Talisman.
Death Cart also seems very overrated. It's quite awful. The best case scenario is that you're using it as payload with Fortress, and you're able to draw it with Fortress every time and you're over-drawing your deck so you don't need to worry about the extra Ruins. I mean that's nice, then it's just terminal +$5, but that's a very specific case. Without Fortress or Rats, it's pretty much useless. It's $5 split over two cards, and you either have to trash a nice action for it (which often is not worth it, and when it is, only marginally), or else you have to trash a Ruins, which is pretty nice, but then you remember Death Cart is what gave you that Ruins in the first place.