Odor elimination. At the very least, a dryer sheet should be able to get rid of unpleasant odors. It would also be better if it actually worked to eliminate the odor, rather than masking it with its own fragrance.
Application. A dryer sheet should be easy and convenient to use. Otherwise, most people simply wouldn’t bother using them. The best products can simply be tossed into the dryer, along with the laundry, and should work its magic automatically.
Quantity. Having a good number of sheets in the box is always a good thing. This saves the trouble of having to purchase new boxes all the time when the sheets inevitably run out.
Quality. A good quality dryer sheet won’t break down, tear apart, or disintegrate in the dryer. It should be able to withstand the drying process without leaving any lint on the clothes. And, of course, it should be able to serve the function for which it is intended.
Price. Dryer sheets aren’t really all that expensive, nor should they be. A large box will cost you more of course, but they generally have a lower price per sheet as compared to smaller boxes.