Masterpiece will make BM strategies more viable.
Stonemason will for sure be a top $2 card just for the overpay mechanic alone.
Soothsayer will be stronger than Sea Hag and IGG but weaker than Witch, Mountebank, and Cultist.
Taxman will be a decent attack near the power level of Cutpusre and Militia.
Plaza will be a strong $4 village, better than Mining Village, but not as good as Wandering Minstrel or Worker's Village
Merchant Guild will fit in perfectly in the right engine, but won't be to exciting on most boards. It will be an average $5 most of the tiem
Candlestick Maker will be an average $2 card, but the fact you can keep your coins for later helps a lot.
Advisor will be an average $4 card. But, on some boards will really shine.
Journeyman is up there with Catacombs, maybe better for terminal draw.
Butcher will be a slightly above average card in most games, but in some engines will really kill. Actually, I think it can end up being pretty strong.
Herald will be a strong $4 card.
Baker will on the same power level as Market most of the time, but the fact it changes the game from the start in my opinion makes it pretty strong even if you don't end up buying a single one the entire game
Doctor will be a solid trasher, but not as good as Forager, Chapel, or Steward. Well, I am not entirely sure about that statement. The ability to trash your cards on turn 1 does seem pretty powerful.