Don't know about the movies, but Snow in Once Upon A Time is not that bad of a character..
besides, in the actual original Snow White, she was pretty dumb and overly trustworthy of everyone...
I mean, she technically dies twice before the apple, first from being choked by the peasant women/queen, then from a poison comb again from the peasant woman/queen, and then the apple. And the Prince didn't originally bring her back from a kiss. He wanted to take her off, glass coffin and all, back to his palace with him and when his men carrying the coffin stumbled, it dislodged the piece of the apple in her throat and boom! she was alive again. Then he tells her he loves her, and to marry him, and she does..
also, they make the queen put on iron slippers that had been sitting above hot coals and had her dance until she dropped dead..