OK, a little harsh perhaps.
You may have an, as yet, under developed palate.
Just try what I suggest.
I do enjoy Bushmills on ice. I think we only mixed it because we weren't going to be awake long enough to sit up and sip on it. I think I fell asleep about 6 sips in anyway. I could see where someone would find such a mixture blasphemous, but it wasn't bad.
I'll see if i can find the Black Bush -- I don't think I saw it when we got the original.
For what it's worth, I probably don't have a discerning palate as I didn't start drinking until sometime late last year. Though my boyfriend was the one who mixed it and he's a culinary student -- I hope that he has a developed palate!