The first episode of Salem reminded me of Sleepy Hollow at times despite taking place almost a hundred years before Ichabod Crane's Revolutionary War exploits. That's not necessarily a bad thing but it's a sign of the big problem the show has. Spoilers ahead.
Salem isn't a bad show. It has the requisite gratuitous nudity (Mary Sibley probably didn't need to strip all the way down to feed her familiar and we probably didn't need to see the preacher having non-missionary sex to know he's not completely on the straight and narrow), striking imagery (thigh nipple!) and a decent cast but after Sleepy Hollow, American Horror Story: Coven, Once Upon a Time and such it's hard to work up enthusiasm for another witch show.
I'm also not sure how long the premise is good for. Witches running the witch trials can only last so long. While Mary still has feelings for John, I don't expect her to be redeemed by love (barf) and will be really disappointed if Mary turns into Regina Mills.