It's not sicky sweet like regular BC icing is & I think that's why people tend to taste the butter more than anything in this icing. I personally like it & don't find an overwhelming butter taste at all. I actually prefer the subtle sweetness of it than the makes my teethtingle sweetness of BC made with icing sugar.
That being said, I'll eat whatever is on my spatula without a second thought!! 
This stuff is not as sweet as simple buttercream. Plus, it doesn't have the gritty texture that simple buttercream can have sometimes. I don't find it too buttery at all. I prefer it to all other frostings. My kids don't like it, though. The texture is divine, though, so I will continue to make it.
Not sure what recipe you used, but I follow the one from Whimsical Bakehouse--Kaye's Buttercream. I find it light, fluffy, silky and not too sweet. Most of my customers have come to me by word of mouth about the buttercream! I will sometimes add a bit of confectioner's sugar to the buttercream when it's done if I need it to be more firm or for a customer who prefers a very sweet icing. I've only added 1/2 cup at the most, though and I think my recipe makes 9 cups of buttercream. I have also tried a couple of the different flavored buttercream recipes on the next page of their book...raspberry and mocha--both were fantastic! I do suggest to my customers that they take the cake out of the fridge 30 minutes-1hour before serving so that the buttercream is not hard--like cold butter.
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