I used to love Guinness! Until I found out what good beer tastes like
There are all sorts of good Stouts out there that don't have the different flavors added. Chocolate is part of the flavor profile of a good stout but it'll have a bit more of a roasted flavor to it than a sweet. It also depends on what yeast and hops you use as to what flavor profile you get. I made a porter once using California ale yeast for one 5 gallon batch and English ale yeast for the other. Two completely different flavor profiles from just the yeast.