When it comes to brisket and pork, because they have to cook so long, I've never had sugar make it sweet. The more sugar the greater the bark, but I would not describe it as sweet the bark as sweet. But you can always add more sugar, and you may pick up a sweet taste.
Here is the recipe for Mr. Brown for Smoke & Spice
•1/4 cup Black Pepper, fresh cracked
•1/4 cup Paprika
•1 /4 cup Turbinado Sugar or Brown Sugar
•2 Tbsp. Salt, Kosher
•2 tsp. Mustard, dry
•1 tsp. Cayenne pepper
(Makes enough for one 6 - 8 lb. Boston Butt)
Cut back on the black pepper and cayenne pepper for less heat.