Goko needs to hurry up and release another Dark Ages set, so I can test Rats in some solo games. I want to know a couple things:
1) How long it takes (and how many you need to buy) before you hit a hand of 5 Rats
2) How quickly Rats/X gets to 4 Provinces, where X is another trasher (in the case of Bishop, how quickly to 24 VP tokens)
We also need to start gauging Attacks - we have Urchin(Mercenary), Marauder, Knights, Cultist, Rogue and Pillage.
From my own experience, I'd say that Cultist lives up to the hype. If you win the Ruins war, your opponent is severely disabled, and you typically have a pretty good drawing machine going on, so even just Cultist/BM would succeed.
Marauder seems a good opener, a la Sea Hag, but less powerful than Cultist, as the benefit is a Spoils to use later.
Knights so far seem like a distraction. I'd like to see if they can be effectively used in an engine.
Pillage is rather nasty, but as it only affects one turn, and it's a one shot, it's almost a waste of money to buy another Pillage just to hurt your opponents again - you'd be better off buying engine pieces. Now, if you can get Graverobber or Rogue to fetch those Pillages back out of the trash, that's a different story.
I have not yet played with Rogue, but my prediction is that, being an amalgam of crappier versions of Knights and Graverobber, it's not going to be all that good.