I prefer the uncomplicated flavor profile single origins offer. Sometimes a blend can have so much going on the flavor simply gets lost or overpowered.
I'm currently trying to finish up what's left (3 lbs.) of a "highly" recommended blend and it's tough doing so because the overpowering component of it is hazelnut. There's a bit of the usual notes most espressos have, but the hazelnut is just killing it for me. Of course I've tweaked the dose, grind, temperature, etc. but it's going nowhere. Will not order that particular coffee again.
People really should give single origins a try more often as general population seems to think most if not all coffee offerings are blends. Awhile back we were doing a large event and a guy comes up and orders an Americano and starts saying "I like it straight, no sugar or crap in it for me.... I normally drink straight espresso anyway"... then starts telling me how he used to be the coffee vendor there and he would roast onsite, yadda, yadda, yadda... Then asks what I'm using for espresso. Told him a single origin Brazil. Dude then tells me it "can't be espresso" if it's not a blend of 3 or more coffees. Of course I like a challenge and within 5 minutes of disputing everything he had to say I had him walking away. He then went to my wife to see if she would listen because he knew I wouldn't be intimidated by his B.S. I gave him one of our cards and told him to send me 1/2 lb. of his best espresso blend. Never heard from him again...
It's people like him that I will NEVER miss with our business!