Positive or negative.

After poor experiences with a baking sheet and a couple of baking pans, I have found two items I like.
A splatter guard for my fry pan (you have to turn it over every so often, or the moisture will accumulate on the underside and drip into the pan.
A baking mat covered in tiny little pyramids. They hold food up off the pan, allowing air to circulate, and grease to run away from the good. (They do have a fairly low weight limit.)