Not necessarily. Jansen, for example, played a LOT better than his numbers showed (at the plate) last season.
Like all voting, the criteria are subjective to the person casting the vote. Personally, I'm fine with a grade A ******* like Schilling being omitted, but I'd be pretty okay with Pete Rose getting in. This is based on me, and my subjective opinions of those players and what they've done both on and off the field.