Well since I'm back from banned camp I can finally give some opinions on this lame excuse for a set.
So 2 cards are different from the original spoilers, Gallade and Mew. For Gallade your opponent chooses which benched Pokemon to bring up which makes it infinitely less playable. And Mew went from broken to useless.
Smeargle is pretty nice, ripping nrgs, works with Gatr obv and Blasty. Thins out the deck a bit too so you'll hit yuor guys/trainers quicker. Palkia LvXs power is amazing. As is MINUNs, omg Minun is really good.
Darkrai Lv X's PokeBody is trash. Seriously. People talking about Weavile and such - no, just no. Its not worth playing just for the Body. Ever. The attack is all it has going for it. And x2 Fighting weakness is really bad.
Re: Sally; 140HP is amazing but the card is only really good with Basic Waters. Which I guess would make Blasty the only option. Now if PK had reprinted RS Swampert rather than Blaze which got an update in Typhlo anyway, this may have been better. But its really clunky as it is.
Oh and remember, guys; THIS IS DP4, NOT DP3. We don't get it until NEXT YEAR. There's another set between Mysterious Treasures and this, so let's just wait and see.