HA! I found just the opposite! The variegated yarn helped to HIDE the mistakes that I inevitably made and then patched up when I discovered them later! I made the scarf in the middle of January and it was COOLLLDDD. (We live in Truckee, CA, often the coldest temp overnight in the nation). It was -22 one morning and I decided I would wear the scarf no matter what it looks like. And one person actually gave me a compliment , so that variegated color worked like a charm!
Now that I'm getting my "knitting legs" I am a little pickier about how stuff turns out.