Yeah, the white granulated stuff gives off flavors.

brown sugar has molasses that adds some depth, or just add different flavorings.

Different yeasts can sometimes save white granulated, but it's more hassle than it's worth, just add different sugars (in addition even) and you'll get something that will have a chance of tasting okay.

Also, yeast nutrient. Add some yeast nutrient. That can save a brew as well.